Thx Andrea
My black ranchu is, I guess, Thai ranchu (at least the parents are, he's bred here in Oz according to the LFS). Velvety black with very minor brassiness underneath.
I'm not looking to get any black offsprings though

just curious what would I get from the two different coloured parents.
One more thing, the red/white ranchu got only one anal fin and the black ranchu got a fused tail (3 lobes instead of 4). Will those traits be passed down to the offsprings?