Additivity of Colour Equations: II

Abstract

If c1 units of one colour are matched by r1, g1 and b1 units of red, green and blue respectively and c2 units of another colour by r2, g2, b2 units, then according to the law of additivity of colour equations the combined colour may be matched by r1 + r2, g1 + g2 and b1 + b2 units respectively. Following an investigation into the validity of the law described in Part I of this paper, further experiments were designed, some to extend the problem and others to attempt to elucidate the cause of the small deviations which occur. Amongst the former was an experiment involving spectrophotometry. All experimental work was performed on the Wright colorimeter.