Yup. It’s called “metamerism.” With most paints, the medium used can affect color, as well as aging. I used to use Ph Martin watercolor dyes, and they were not

Yup. It’s called “metamerism.” With most paints, the medium used can affect color, as well as aging. I used to use Ph Martin watercolor dyes, and they were notorious for fading after a relatively short time. The illustrations that I colored with them, are now monochrome. I’m sure they’re better, now. Pigment science has come a long way. Acrylic was always a lot longer-lasting. Also, context matters. Our perception changes, based on surrounding colors. There’s a bunch of optical illusions that leverage this. But I think this is kind of a cool project.