Leucistic Licorice Black Rat snake

One animal carrying both genes. Each one is inherited separately, so this combination is made by bringing them together rather than being a gene of its own.

The two genes

Leucistic: recessive; Pure white with dark eyes — not an albino, because the eyes carry pigment.
Licorice: recessive; Heavily darkened, giving a near-uniformly black animal with the pattern lost.

How one is made

Both genes have to come together in the same animal. The pairing that does it most directly is Leucistic × Licorice, which works out every outcome and its odds.

Every Black Rat snake combination