After reading your comment I thought of the following: 1) Considering that a tetrachromatic colour X is seen by regular folks as a trichromatic colour Y. Then

After reading your comment I thought of the following: 1) Considering that a tetrachromatic colour X is seen by regular folks as a trichromatic colour Y. Then: 2) Are all artificial representations (paint) of the tetrachromatic colour X also seen by regular folks as the trichromatic colour Y? I guess your hypothesis is true only if the answer to the above question is "yes".