25% Black Pewters 50% Pastels 25% Black Pastels...
I'm pretty sure.
Close. It's actually 50% black pewters and 50% pastels.
When you breed the homozygous(super pastel in this case) to something, every offspring will be a het(which would be pastel). And then in this case mating with the black pastel, half would carry that gene as well, which translates to 50% black pewters and 50% pastels.