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The purpose of this paper is to compare light fastness assessments by exposure of fabric dyes with various dyes in daylight and an artificial xenon arc lamp.

Cotton fabric dyed with 66 reactive, vat, azoic and direct dyes dyed in different depths were exposed to daylight and Xenon arc lamp for assessment of light fastness by standard methods. The light fastness rating and fading hours by the two methods were analysed and compared statistically.

The correlation between the corresponding light fastness rating (LFR) measured in Xenotest and daylight is quite high (0.93). The logarithmic correlation coefficients between fading hour (FH) and LFR in Xenotest and daylight are 0.95 and 0.88, respectively. For Xenotest, the assessed LFRs are same as those predicted from geometric progression up to LFR of 5.5, and thereafter, the former is higher. On the other hand, in the case of daylight, the assessed LFR is lower. Assessments for three successive seasons showed high repeatability in case of Xenotest and moderate repeatability in case of daylight. Assessments for three successive seasons showed high repeatability in case of Xenotest and moderate repeatability in case of daylight.

The exposure conditions in daylight cannot be controlled or standardised, whereas the exposure in Xenon arc lamp in the accelerated fading instrument can be strictly controlled. These differences in exposure control may affect the repeatability of experimental findings.

Inconsistent ratings may be because of little deterioration of samples during storage, as well as seasonal variation of daylight.

There are no direct social implications.

The researches on the comparison of the two light fastness assessment methods have not been reported in any recent publication to the best our knowledge.

Heraeus has launched the Xenotest Alpha, a new series of modular units enabling test conditions to be matched with specifications and ensuring purchasers obtain only the test features required.

Heraeus is a name synonymous with testing, particularly sunlight and weather exposure testing. Light testing equipment was a logical development for the smelting and engineering firm founded in Hanau, Germany, in 1851, which produced the first high purity quartz glass at the turn of the century. The development of quartz lamps led, at first, to the production of artificial sunlight lamps for medical purposes.

The purpose of this paper is to evaluate and discuss colour properties, stability and lightfastness after accelerated exposure in xenon‐arc light apparatus, of 3D ink jet prints produced by using 3D colour printing process.

3D colour prints were produced using ZCorporation 3D printing method. The samples were divided into groups according to the finishing process applied (untreated, finished with different infiltrants). Colorimetric properties were measured using spectrophotometer. Samples were placed into xenon‐arc based weathering apparatus (Xenotest), using the preset glass filtered sunlight, standard indoor conditions. Colour stability was evaluated as change in colour after repeating the spectrophotometer measurements and comparing spectral and specific colorimetric values of initial and exposed samples.

Based on methodology used, the analysis has shown the changes in colour appearance of differently finished 3D prints, which were mostly attributed to chroma and lightness variations. The colour stability of samples studied noticeably varied and is dependent on colour, percentage of ink coverage and finishing method. Issues of colour and stability of 3D ink jet prints could become important as 3D printing emerges into new application areas, in which the object properties will need to be maintained for a certain amount of time.

The research is comparative and is limited to the specific materials and procedures used.

The paper describes aspects of colour 3D printing for which the published research and literature data are still, for the most part, lacking. Colour measurements methodology and evaluation of stability described could be of value for further research and for users of the technology.

Marley Floors Ltd, based at Maid‐stone, Kent has adopted the Heraeus Xenotest 150S light and weather fastness tester as a research and development tool for assessing the colour stability of materials such as the Marley range of cushion vinyl floor coverings.

Flux Pumps continues its consistent programme of product innovation with the announcement of the F424, a sealless barrel or container pump which, it is claimed, is maintenance free.

Controlling paint production. Paint users are placing higher demands on the manufacturer. All paint producers should now consider data acquisition — and possibly automated paint manufacturing if the volumes of certain products will justify it.

A compact, yet powerful automatic cleaning system that as a result of its design and unique cleaning action has eliminated many of the conventional cleaning difficulties and safety drawbacks of cleaning large vessels from a top entry port is now being marketed byspecialists CDN Systems. Its recent introduction to a plant handling large quantities of dye, where tanks of 100 cu. metres had always been cleaned manually with the use of hoses, has made a dramatic difference to the cleaning operation especially in terms of safety improvement.

In order to cope with a substantial increase in output and enhance customer services, Mebon Ltd — a leading company in surface coatings technology — has invested approaching £2 million in a 50,000 sq metre warehouse.

Paint Manufacturer, AB Wilhelm Becker is this year celebrating its 125th Anniversary, with worldwide parties commemorating the event.