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They are recessive genes meaning they need 2 copies to show.
2 copies of snowflake + at least het Lp (appy)
2 copies of Kit Promoter + 2 kit genes (Roan, W20, etc)

Snowflake can be found in foundations, normally Het only but someone did get a Hom Snowflake once. Still the chances are low, as ObsidianKitsune said the gene was for sale at one point. Will it be for sale again, I'm unsure only Ammit knows.

It's 10 gmts for Hom KP to be added to a foundation.

Perfect Foundations, Ranks Specials and Ex pros seem to be the most common for Gmt horses.

Here are just a couple of additions:

1. The two Kit mutations don't have to be different. For Roan and Tobiano, especially, the horse can be homozygous for one and homozygous for KP, and the cloudy effect will show up.

2. The spontaneous Snowflake carriers that are sometimes created are not always or even mostly, I think, appaloosas. It's when they are bred to a snowflake carrying appaloosa who hands down a copy of both that the truth pops out because the foal is obviously a snowflake appaloosa.