I have no interest in testing for colour. I don't breed for it and kind of like to be surprised when the foal arrives.
Star has never sired a red foal so I suspect he is homozygous for black.
I do tell those who are interested in breeding to him that fact but also state I have never had him tested.
Not that I have a problem with others testing . I have turned down more than a few mares because their owners were interested in a black foal not how well their mares and Star would cross. Shalom