As I posted earlier that I would, I did breed my SS-Blue & White girl against a Russian Black boy, and the offspring was a SS- Blue&White kitten.
Unfortunately I cannot say there was not a Tonk Blue Mink hider in the Russian Black with 100% certainty, so I have not posted the pedigree result.
I can say that of 11 of 12 kittens bred with the RB father that all were Russian Black (and the 12th was SS-B&W), and even when bred against a TBM hider, the grandparents also were all Russian Blacks. So while I suspect my RB was pure, I cant prove it, and the father has finally aged out.
I will have proof of the hider fur in my 7 day old SS-B&W kitten in a week I hope - if its RB then the range is narrowed down. It it's TBM, well, never mind. I can post the pedigrees to date later tonight just for info.
Shamu