I’ve been looking a lot at genetics because I am figuring out the official genes for acotles. I am including both champagne and cream in my list. Both of these are dilution genes, causing the coat to become lighter.
The cream gene can occur twice, creating even lighter horses. It can also be in pair with champagne making some really beautiful horses. The cream gene is an incomplete dominant, meaning that it is always visible if the gene is present. Buckskin and palomino horses both have one cream gene present. Champagne can also appear with dun, creating lighter duns.
My favorite combination is when a bay horse has both champagne and cream present, making an amber ivory champagne.