[or reverse it for axanthic heterozygous snow]

Albino heterozygous for axanthic = aab⁺ X Axanthic = bb⁺⁺

The following are averages over a long period of time (out of a possible 16) you get:

8 double heterozygous for snow = a⁺b⁺
8 Axanthic heterozygous albino = a⁺bb