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I am not an expert but I think it is also referred to as lavender.
This will help.
A Slate, is black based with a single dominant slate gene.(Genotype: BBDd), sometimes called a Splash and are slate or ashy blue with specks of black scattered over the feathers. The Self Blue "aka Lavender" is also black based but have two dominant slate genes.(Genotype:BBDD),they are more of a solid, dull, grayish-blue with the hens a lighter bluish gray. The Black (Genotype:BBdd)is just that, black.
Just want to make an important note here that most of the information found on some of the more popular websites on the results of breeding blue turkeys is inaccurate, the following is the correct results .
When breeding Slate to Slate, the results are turkeys of three different colors, Slate,Self Blue and Black.
When breeding Self Blue to Self Blue, only Self Blues result.
When breeding Self Blue to Black, only slates result.
When breeding Slate to Black both slates and blacks result, with no self blues.
When breeding Self Blue to Slate both Slates and Self Blues result, with no blacks.
When breeding Black to Black, just Blacks result.