Hang on. Silver is a ground colour - so the pattern on top of it can be black, blue, cream, etc.......anything but purple or green! A silver tabby (whatever colour) MCO is the same as a silver tabby in any other breed and the same for blues. My point is that to produce Jupiter, one parent MUST be a silver. It seems that neither parent is registered as such. (How about putting their colours on the pedigree on your site?) And if Black Magic is indeed a black silver tabby, the same applies there - strengthens the argument, as they are siblings. He still doesn't strike me as very silver looking in the better pics.

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Lesley (Tasmania)