[Alamo-Girl]

Thank you for your reply and challenge!

If color exists independently of the eye and brain, why will some people say that two color chips match exactly, and other people say they don't?

The observer has nothing to do with the truth of the matter - whether the two color chips are identical or not.

Indeed, you may present the same color chip multiple times to a single observer and get mixed responses - when you as the investigator have prior knowledge that it is in fact the same color chip.

[js1138]

The observer has nothing to do with the truth of the matter - whether the two color chips are identical or not.

we are not discussing whether the chips are ideentical. In my example they are not. We are discussing whether they are perceived as the same color.

You are fond of envoking mathematics. Give me a mathematical description of the color green. What are the spectral characteristics of green? Be careful. You have asserted that pigments, such as Pantone chips, can have an objective color. What is the essential spectral characteristic of a green Pantone chip?