[CindyDawg]

Last night I was reading about color and that gray dominant, then bay and then chestnut. How do paints fit into this?

[Duchess47]

White isn't a color, it's the absence of color (pigmentation). Pintos/paints would be classified by their base coat color; bay, black, chestnut, etc. If they had a greying gene, they would eventually turn all or partially grey (white looking).

If I understand it correctly, grey would modify the original color.