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1. From the information given to the Committee by members of the trade the following conclusions were drawn : (i) Four main types of product are sold under a name commonly including the word “vinegar,” namely (a) the product of the alcoholic and acetous fermentation of a saccharine liquid, the sugars in which are derived entirely or mainly from the saccharification of starch by the diastase of malt; (b) the product obtained by the distillation of (a); (c) the product of the acetous fermentation of a distilled alcoholic fluid; (d) the product, with or without colouring and/or flavouring matter, obtained by diluting acetic acid to an appropriate strength. In addition, strong acetic acid is available in various strengths, with or without added colouring and/or flavouring matter, labelled in various ways to indicate relationship with vinegar, (ii) The commonly accepted minimum standard for the purposes of the Food and Drugs Act is 4 per cent. w/v of acetic acid. (iii) Malt Vinegar as obtained by the brewing process may contain up to 8 per cent. w/v of acetic acid. This is diluted to the required strength and three strengths are commonly recognised in the trade, being known respectively as Nos. 16, 20 and 24, which correspond approximately to acetic acid contents of 4, 5 and 6 per cent. w/v. (iv) Malt vinegar as generally sold from bulk is the No. 16 quality and contains from 4 to about 4·75 per cent. w/v of acetic acid. That sold in bottles is usually the No. 20 quality, but there is also a small sale to the public of No. 24 quality. (v) The colouring matter commonly used in vinegar is caramel, although one or two manufacturers, probably as a result of the present shortage of caramel, may use other colouring matters. (vi) The value of brewed vinegar as a condiment does not depend solely upon the acetic acid content. Other constituents add body and aroma while some have a buffering effect which makes the product less sharp to the taste than a dilution of acetic acid containing the same proportion of free acid. (vii) Dilute solutions of acetic acid, with or without added colour and/or flavour, are now commonly sold under the name “non‐brewed vinegar” and are sometimes preferred for pickling purposes and for use on fried fish. (viii) The acetic acid content of such solutions, as usually sold, falls within the range of 4 to 5 per cent. w/v. (ix) Concentrated products, often known as “vinegar essence,” frequently contain about 50 per cent. w/v of acetic acid and before use require dilution with eleven times their volume of water; products are also available which require to be diluted with as much as 17 or as little as 5 times their volume of water. (x) An excise licence is required by any person “who shall make, prepare, extract, distil, purify or sell any liquors prepared or capable of being used or applied to the purposes of vinegar or acetous acid made for sale, not being a dealer in or retailer or seller of such vinegar or acetous acid only.” An unlicensed person cannot lawfully produce artificial or non‐brewed vinegar by adding colouring matter to the liquid obtained by diluting strong acetic acid. 2. In normal times malt vinegar is prepared by the alcoholic and acetous fermentation of an infusion of malted barley with unmalted barley and with or without other cereals. The process of manufacture is characterised by the fact that the starch in the cereals is converted into sugars by the action of the diastase in the malt prior to the fermentation processes. An element of complication has, however, been introduced into the framing of a definition as a result of war‐time difficulties. In 1942, in order to secure an increased output of “malt vinegar,” the Ministry of Food approved the addition of sugar to the wort. The amount that may be added must not exceed 15 per cent. of the sugars present in the wort as a result of the action of diastase on the starch, but since the sugars in the infusion which undergoes fermentation are no longer derived entirely from the starch by the hydrolytic action of the diastase of malt, the product no longer conforms to what the Committee would regard as the appropriate peacetime definition of malt vinegar. It was stated by the manufacturers that the analytical characterisations of the vinegar obtained in this way arc within the range appropriate to genuine malt vinegar of peacetime quality, and that no difference is detectable by the ordinary user. The Committee desires, however, to record its view that this use of sugar should be regarded as a war‐time expedient and should be discontinued as soon as the requisite cereals are again in full supply. 3. Distilled vinegar is prepared, as the name implies, by distilling vinegar. It is understood that the only distilled vinegar now on the market in this country is that prepared by the distillation of malt vinegar, and the Committee recommends that the name “distilled vinegar” without any further qualification should be applied only to distilled malt vinegar. 4. Spirit vinegar is prepared by the acetous fermentation of a distilled alcoholic liquid. As thus prepared it contains about 10 per cent. weight in volume of acetic acid and for retail sale it is commonly diluted to a strength of 4 to 5 per cent. 5. The nomenclature of the products obtained by diluting acetic acid, with or without the addition of colour, has been a matter of controversy in the vinegar trade for many years, and the Committee received representations on the subject on behalf of the Malt Vinegar Brewers‘ Federation and the Association of Non‐Brewed Vinegar Manufacturers. 6. The Malt Vinegar Brewers' Federation, while advocating that these products should be known as “artificial” or “imitation” vinegar, raised particular objection to the current practice of describing them as “non‐brewed vinegar.” Their argument was that the term is misleading as to the source, nature, substance and quality of the article and that its use on a label is an offence under Section 6 of the Food and Drugs Act, 1938 (since replaced by Regulation 1 of the Defence (Sale of Food) Regulations, 1943). It was claimed that the term indicated merely that a mashtun had not been used in the manufacture of the product and that it might be applied with equal propriety to other kinds of vinegar, for example, wine vinegar, molasses vinegar, etc. The attention of the Committee was also directed to the fact that in the Dominions and other countries where the labelling of foods is more fully controlled than here, these products are required to be so labelled as clearly to distinguish them from products made by a method which includes a process of acetous fermentation, and reference was made to the statement issued by the Society of Public Analysts and Other Analytical Chemists in 1935, after consultation with the Malt Vinegar Brewers' Federation, recommending the use of the description “artificial” or “imitation.” 7. On behalf of the Association of Non‐Brewed Vinegar Manufacturers it was claimed that the Society of Public Analysts had not consulted them before issuing their statement and that the use of the description “artificial” or “imitation” would have a serious effect on sales since it would convey to the public the idea that the product was inferior to “vinegar.” It was pointed out that the term “vinegar” originally connoted sour wine, and it was suggested that malt vinegar was equally an “imitation” of the original article and also “artificial” in the sense that it is manufactured by a process which is controlled by artificial means. 6. The two trade organisations differed in their statements as to the period during which the term “non‐brewed” had been in use. Whereas the Federation suggested that it had only been used during the last five years, the Association claimed that it had been in use to a gradually increasing extent for at least 20 years and that for more than twelve years they had recommended its use whenever they had been asked to advise in regard to labels. The Association agreed that the general use of the name by manufacturers dated from the case of Sutton v. Tame which came before the County of London Sessions Appeals Committee in 1937 and which is generally regarded in the trade as a test case on the nomenclature of vinegar. The proceedings were originally instituted under Section 2 of the Food and Drugs (Adulteration) Act, 1928, as the result of a sale of coloured diluted acetic acid when “table vinegar” was demanded. After hearing much evidence from both sides the Appeals Committee decided that the sale of a substance as “vinegar” or “table vinegar” without any qualification or explanation as to its origin being given by the seller to the purchaser implied that the product had been produced by a process of fermentation. In announcing this decision, the Chairman of the Appeals Committee remarked that “the fact that a very large majority of manufacturers add such words as ‘wood,’ ‘non‐brewed’ or similar words of that description to the products shows, in the opinion of the Committee, that the words “table vinegar” are not considered by the custom of the trade sufficient to describe it.” (Analyst, 1937, 62, 607.) 9. The manufacturers of the products consisting of diluted acetic acid have regarded these remarks as justifying the use of the name “non‐brewed vinegar,” but the Committee was informed on behalf of the malt vinegar brewers that this interpretation was not accepted by them and that had it not been for the war they would have taken all possible steps to challenge the name under the provisions of Section 6 of the Food and Drugs Act, 1938. The present position, however, according to the evidence available to the Committee, is that practically all manufacturers of the product are using the description “non‐brewed” on labels, and that the quantity sold is nearly equal to that of malt vinegar. 10. In reviewing the various arguments put before it the Committee has primarily had regard to the protection of the consuming public. If “non‐brewed vinegar” was about to be marketed for the first time the Committee would have considered that the description “artificial vinegar” was more appropriate than “non‐brewed vinegar,” and better calculated to convey to the public the idea of a product which embodies some, but not all, of the properties of malt vinegar. On the other hand, the Committee feels bound to take cognisance of the fact that the description “non‐brewed” has been in use to a greater or lesser extent for several years; that the description did not attract any adverse comment from the Chairman of the London Sessions Appeals Committee in 1937; and that no instance of a successful prosecution under Section 30 (1) of the Food and Drugs (Adulteration) Act, 1928, or Section 6 of the Food and Drugs Act, 1938, has been brought to its notice. The description “non‐brewed” probably conveys no more to the general public than that the product is something different from malt vinegar, but the Committee would hesitate to say that the description is misleading. 11. In short, it appears to the Committee that the importance of the description attached to this product can easily be exaggerated, and that if, as it suspects, the term “non‐brewed” conveys little to the general public the proper remedy is better instruction. It is suggested that the publication of a simple and impartial statement of the facts would help them to appreciate the nature, substance and quality of the different types of vinegar on the market. For the purpose of this report, therefore, and in the absence of an authoritative ruling as to the appropriate designation of the product, the Committee has adopted the alternative descriptions “artificial vinegar” or “non‐brewed vinegar.” 12. In regard to the nomenclature of solutions of acetic acid of strengths in excess of that suitable, without further dilution, for use as vinegar, it was suggested to the Committee that for the protection of the public it was desirable that such preparations should not be described by any designation incorporating the word “vinegar,” however qualified. Names such as “edible acetic acid,” or “acetic acid of edible quality” were put forward as suitable alternatives, but they are open to the suggestion that only those with technical knowledge would appreciate their significance. To the majority of persons the adjective “edible” would convey the impression that preparations so labelled are suitable for use without further dilution, whereas, in fact, they have hitherto commonly contained 50 per cent. of acetic acid and sometimes considerably more. On the other hand, it was urged that the chief purchasers of those products are fish fryers, who are thoroughly familiar with their use and that it would be unreasonable to prohibit the inclusion of the word “vinegar” in the name of a product which on dilution gives a liquid identical with that frequently sold under the name “non‐brewed vinegar.” The essential requirement is that the user should appreciate that the product is not suitable for use in the form in which it is purchased, and that he should know exactly how to dilute it to the appropriate strength. 13. The Committee was informed that several of these products are at present sold without any indication on the label of the extent to which they should be diluted before use. Although the matter is not strictly within its terms of reference, the Committee wishes to record its opinion that such information should be required to appear on labels, particularly since there is considerable variation in the strengths of the products now on the market. In the opinion of the Committee, vague directions such as “Dilute to taste” are not a sufficient protection. 14. A further aspect of the sale of concentrated products to which the attention of the Committee was directed was the danger that may arise from distribution to the public in small bottles. Although, again, the matter may not be strictly within its terms of reference the Committee suggests that consideration might well be given to prohibiting such sales provided interference with the legitimate sale of the higher concentrations of acetic acid, labelled as such, can be avoided. It would also be a further safeguard if all these products were required to conform to a single standard of strength and it is suggested that a strength of from 50 to 60 per cent. weight in volume would be appropriate. 15. If on further examination it is found practicable to give effect to those suggestions, there will be less necessity to rely on the name given to the product to secure adequate protection. Among the names at present in use are “Vinegar Essence,” “Concentrated Vinegar Essence,” “Wood Vinegar Essence” and “Non‐Brewed Vinegar Essence”; there are also a number of products sold under proprietary names, most of which suggest some association with vinegar. The Committee is of the opinion that the statement made by the Chairman of the London Sessions Appeals Committee in the case referred to above, to the effect that the name “Vinegar” without qualification indicates a product obtained by fermentation, is equally applicable to the concentrated preparations. It therefore considers that the name “Vinegar Essence” is misleading. In this report the descriptions “concentrated artificial vinegar” or “concentrated non‐brewed vinegar” have been adopted corresponding to the descriptions adopted for dilute solutions. The Committee recommends that products sold under a proprietary trade name should be required to use one of those descriptions either in addition to or instead of the trade name. 16. The Committee accordingly recommends the following definitions for the various descriptions of vinegar : “Malt Vinegar” means the product containing not less than 4 per cent. weight in volume of acetic acid, CH3.COOH, made by the alcoholic and subsequent acetous fermentation without intermediate distillation of an infusion of malted barley with or without unmalted barley or other cereals, the starch of which has been saccharified by the diastase of malt; and includes the product obtained by fermentation of a cereal infusion as aforesaid to which infusion has been added sugar in amount not exceeding 15 per cent. of the sugars present in the infusion as a result of the saccharification by the diastase of malt. It may contain added colouring matter. “Artificial Vinegar” or “Non‐Brewed Vinegar” means a solution of acetic acid of edible quality, with or without added colouring and/or flavouring matter, containing not less than 4 per cent. weight in volume and not more than 8 per cent. weight in volume of acetic acid, CH3.COOH, the acid not being wholly produced by a process of acetous fermentation; but does not include such a solution containing neither colouring nor flavouring matter unless so sold or described as to lend an intending purchaser to believe that he is purchasing a description of vinegar. “Concentrated Artificial Vinegar” or “Concentrated Non‐Brewed Vinegar” means a solution of acetic acid of edible quality, with or without added colouring and/or flavouring matter, containing not less than 50 per cent. and not more than 60 per cent. weight in volume of acetic acid CH3.COOH, the acid not being wholly produced by a process of acetous fermentation; but does not include such a solution containing neither colouring nor flavouring matter unless so sold or described as to lead an intending purchaser to believe that he is purchasing a description of concentrated vinegar. “Spirit Vinegar” means the product, with or without added colouring matter and containing not less than 4 per cent. and not more than 15 per cent. weight in volume of acetic acid, CH3.COOH, obtained by the acetous fermentation of a distilled alcoholic liquid. “Distilled Vinegar” means the product, with or without added colouring matter and containing not less than 4 per cent. weight in volume of acetic acid, CH3.COOH, obtained by the distribution of malt vinegar.

Considers the advantages of highly alloyed stainless steel such as duplex stainless steels or nickel‐based alloys in highly corrosive environments. Looks at corrosion rates for alloys in acetic acid and presents results of tests on the influence of contaminants in the acid. Gives practical applications. Concludes that duplex stainless steels demonstrate higher corrosion resistance than austenitic stainless steels and are often comparable to nickel base alloys.

The purpose of this study was to investigate the corrosion of low molecular organic acids from water-steam cycles such as acetic acid and formic acid in mental parts of steam turbine initial condensation zone.

The corrosion behavior of gray cast iron in initial condensate containing different concentrations of acetic acid and formic acid was studied by weight loss test, scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction.

The results indicated that gray cast iron had a certain degree of corrosion in the simulated initial condensate containing acetic acid and formic acid, but the acid corrosion of gray cast iron was not only caused by low molecular organic acid but also affected by inorganic anions such as Cl⁻. When Cl⁻ existed, after removing corrosion products, surface analysis results proved that the surface of gray cast iron was rough and uneven with many cracks, which was corrected more serious.

The corrosion behavior of thermal equipment by low molecular organic acids and inorganic anions in water-steam cycles was studied. The research results can provide theoretical guidelines for corrosion control of steam turbine in power plants.

The purpose of this paper is to construct an array of sensors using polypyrrole–zinc oxide (PPy–ZnO) and PPy–vanadium (V; chemical formula: V₂O₅) fibers. To test responses of sensors, a central composite design (CCD) has been used. The results of the CCD technique revealed that the developed sensors are orthogonally sensitive to diacetyl, lactic acid and acetic acid. In total, 20 different mixtures of diacetyl, lactic acid and acetic acid were prepared, and the responses of the array sensors were recorded for each mixture.

A response surface regression analysis has been used for correlating the responses of the sensors to diacetyl, lactic acid and acetic acid concentrations during the gas phase in food samples. The developed multivariate model was used for simultaneous determination of diacetyl, lactic acid and acetic acid concentrations. Some food samples with unknown concentrations of diacetyl, lactic acid and acetic acid were provided, and the responses of array sensors to each were recorded.

The responses of each sensor were considered as target response in a response optimizer, and by an overall composite desirability, the concentration of each analyte was predicted. The present work suggests the applicability of the response surface regression analysis as a modeling technique for correlating the responses of sensor arrays to concentration profiles of diacetyl, lactic acid and acetic acid in food samples.

The PPy–ZnO and PPy–V₂O₅ nanocomposite fibers were synthesized by chemical polymerization. The provided conducting fibers, PPy–ZnO and PPy–V₂O₅, were used in an array gas sensor system for the analysis of volatile compounds (diacetyl, lactic acid and acetic acid) added to yogurt and milk samples.

Introduction The competitive complexation of Sn(II) hydroxycomplexes and Sn(II) complexes with organic acids present in fruit juices, has been studied, in a first stage, by the experimental method of titration. This method allows to compare the complexing power of different organic acids. Applied to tartaric and acetic acids it shows that tartaric acid is more complexing towards tin than acetic acid.

The purpose of this paper is to supplement the scant previous investigations on the corrosion behaviour of 2205 and 2507 duplex stainless steels in selected organic acids containing chloride additions.

Microstructural examination of the alloys was first carried out, after which the corrosion behaviour of the alloys in citric, oxalic, formic and acetic acids containing chloride additions at varying temperatures was studied using electrochemical techniques.

The alloy 2507 material had a larger grain size than did the alloy 2205 sample. The corrosion resistances of the alloys generally are highest in acetic acids and lowest in citric acid. The addition of chloride had a pronounced effect on their corrosion resistance. Alloy 2507 generally exhibited higher corrosion resistance in all of the acids than alloy 2205, with the exception of acetic acid at room temperature. The 50:50 ratio of ferrite to austenite composition, as revealed by phase compositional analysis, indicated no significant possibility for galvanic corrosion between the phases. This suggests that the corrosion behaviour of the alloys is controlled by their grain sizes and chemical compositions.

Although the corrosion behaviour of duplex stainless steels in some organic acid media has been reported, this investigation covers the major organic acids not previously reported. Since in real industrial systems a mixture of both organic and minerals acids/salts may typically exist, investigations of the combined effect of chloride ions with the organic acids reported in this paper typify real industrial operations. The paper thus provides a basis for material selection for the application of 2205 and 2507 in industrial systems where organic acids are mostly used.

The food standards of the Indiana State Board of Health, which appear on another page, show that it is quite possible to lay down official definitions of various articles of food; and a study of these regulations may be of assistance to those authorities who are striving to arrive at some form of order out of the chaos which at present exists in this country in matters relating to food standards. With reference to milk, it will be seen that not only is the question of composition dealt with, but strict directions are given that milk derived from a cow which can in any way be considered as diseased is regarded as impure, and must therefore, says the Board, be considered as adulterated. In regard to butter and margarine, limits are given for the total amount of fat—which must consist entirely of milk‐fat in the case of the former substance—water, and salt; and not only are all preservatives forbidden, but the colouring matters are restricted, only certain vegetable colouring matters and some few coal‐tar colours being permitted. All cheese containing less than 10 per cent, of fat derived from milk must be plainly labelled as “ skim‐milk cheese”; and if it contains fat other than milk‐fat, it must be described as “ filled cheese.” Some exception is taken to the use of preservatives in cheese, inasmuch as it appears that cheese may contain a preservative if the name of such preservative is duly notified upon the label ; and the rules for the colouring of cheese are the same as those which apply to butter and margarine. All articles of food containing preservatives are considered as adulterated unless the package bears a label, printed in plain type and quite visible to the purchaser, stating that a preservative is present, and also giving the name of the preservative which has been used. Articles of confectionery must not contain any ingredient deleterious to health, such as terra alba, barytes, talc, or other mineral substance, nor may they contain poisonous colours or flavours.

The purpose of this paper is to investigate the inhibitive effect of azathiones, namely cyclopentyl‐tetrahydro‐azathione, cyclohexyl‐tetrahydro‐azathione and isobutyl‐methyl‐tetrahydro‐azathione on the corrosion of carbon steel in formic and acetic acid solution. The effect of inhibitor concentration, immersion time, acid concentration, and solution temperature on the inhibition efficiencies of the selected azathiones were studied systematically.

The synthesis of inhibitor was confirmed by methods such as Fourier transform infrared and nuclear magnetic resonance studies. All inhibition experiments were conducted on carbon steel in 20 percent formic acid and 20 percent acetic acid solution. Weight loss experiments were carried out according to the American Society for Testing and Materials standard procedure. Polarization studies were carried out in a three electrode cell assembly connected to an EG&G Princeton Applied Research potentiostat/galvanostat (model 173). The electrochemical impedance technique was carried out using Zahner IM‐6 electrochemical workstation at a frequency range of 5‐100 Hz. The scanning electron microscopy (SEM) study was carried out using a VP LEO model no. 435 microscope for the surface characterization of inhibited and uninhibited metal surfaces.

Various thermodynamic parameters were calculated using weight loss data in order to elaborate the mechanism of corrosion inhibition. Polarization measurements revealed that the studied azathiones acted predominantly as mixed inhibitors. Electrochemical impedance measurements revealed that the compounds were adsorbed onto the carbon steel surface and the adsorption obeyed the Langmuir adsorption isotherm. The SEM study showed that the inhibited metal surfaces were smoother than were uninhibited metal surfaces.

The presence of high efficiency and low cost inhibitors is essential for protection of carbon steel. In comparison with conventional carbon steel corrosion inhibitors, these findings would be considered as a step forward in development of new corrosion inhibitor.

This paper reveals that azathiones can be used successfully for the protection of carbon steel surfaces exposed in acid solution.

This paper aims to analyze the high temperature (200°C) corrosion behavior of 2205 duplex stainless steel in acidizing stimulation solution containing hydrochloric acid (HCl) and acetic acid.

The corrosion rate of 2205 duplex stainless steel in all kinds of acid solutions was calculated through immersion tests and electrochemical test. The corrosion product composition is analyzed by X-ray diffraction analysis. The element composition and element distribution before and after corrosion were analyzed by an X-ray energy spectrometer. The corrosion morphology of the steel surface was observed by a scanning electron microscope. Both static and dynamic corrosion experiments were carried out at 200°C.

The results show that 2205 duplex stainless steel has excellent corrosion resistance in low to high concentration acetic acid solutions, but increasing the concentration of Cl⁻ in acetic acid solution will accelerate the corrosion rate. Low concentration HCl solution can cause serious corrosion to 2205 duplex stainless steel. The system of HCl and acetic acid will produce a synergistic effect on corrosion of 2205 duplex stainless steel and accelerate the corrosion. Sb₂O₃ is a good corrosion inhibitor synergist for high-temperature acidizing stimulation solution.

The amount of HCl that is used in acidizing stimulation is usually determined by the dissolution effect of the acid on the rocks, but for ultra-high-temperature reservoirs, the amount of HCl should be based on reducing the corrosion of oil and gas wells.

In spite of the present importance of cobalt, relatively little information is available on the resistance of this metal to corrosion. Probably the main reason for the paucity of data on this subject is that, although the corrosion resistance at elevated temperatures of several cobalt‐base alloys is outstanding, cobalt is not utilised to any appreciable extent in its unalloyed condition, owing to the greater abundance and lower price of its sister metal nickel.