Human cones in the retina decipher the colors through an additive system that involves differential stimulation of three kinds of cones. Do color tests such as Fransworth Munsell 100 hue test or its online variants use a subtractive system? And why so many non-spectral hues?
Kazuhito Ujima
Most of the stimuli in the color blindness test may be due to being printed in ink.
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Joao Linhares
The way ink mixtures to create a particular hue follows the law of subtractive mixture, as it will reflect what will not be absorbed. (In reality it will reflect, scatter and diffuse what will not be absorbed). The light resulting from the reflection will reach the retina and induce a retinal response, by the means of phototransduction.
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