Pigments

Carotenoids present in egg yolk have been demonstrated to be highly bioavailable, which makes eggs an interesting carrier of these biologically active pigments.

Yellow is a primary colour of pigments, but not of light; those are only red, green, and blue.

We're lucky to live in an era where we don't have to rely on toxic pigments like vermilion or Paris green.

Plant pigments such as the carotenoids and chlorophylls will react similarly when exposed to light of high intensity.