I don't know about rare colors really. In general I'd think double dilutes are relatively uncommon.
A black horse is black. It cannot turn brown, as brown is a completely different genetic color. Many black horses have coats that fade to a brownish color in the sun, but that's normal and it doesn't make the horse any less black.
I have a black QH. I'm know that's not a rare color.
I have never seen a silver QH though.
Does your qh have white or is it purely black with no markings? I've always been told a TRUE black horse with no other markings is rare. Weather it's true or not-who knows. Haha Posted via Mobile Device