I imagine there was a gradual process of discovery and little by little we learned more about the way we process light and send it to our brains. But I’m still having a really hard time understanding how we even started to question how many colors we see in the first place. Would really appreciate an explanation.
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It is possible to quite accurately recreate every color in a laboratory. Not just combinations of the three primary colors. You can then show two colors to someone and ask them if they see a difference. If you show them two different colors that they are not able to distinguish between then you know their cones have the same response to those spectrum. Based on their response you can then find out how sensitive each of the cones are to different frequencies of light. This not only works on humans but also other animals.
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