The crucial importance of the light source to successful colour matching can now be quickly and emphatically demonstrated with the Munsell Matchpoint Metameric Colour rule available from Macbeth. Operating as a slide rule, it provides quantitative evidence of the degree of metamerism — colours apparantly matching under one lighting condition mismatching under another — which is a prime consideration to those involved in making critical colour matching decisions. In addition, it can be used to compare the colour vision characteristics of people when used under a common light source.
(1990), "Equipment", Pigment & Resin Technology, Vol. 19 No. 10, pp. 16-18. https://doi.org/10.1108/eb042776
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