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"Eyes black. The ground colour should be as black as possible. The undercolour to be rich blue-black. Eye black. The silvering should be even throughout. The tan belly shall be a rich golden orange hue, as rich as possible and there should be a clear line of demarcation between top colour and tan running in a straight line along flanks, chest and jaws. There should be no brindling or guard hairs. Colour of feet should be inside tan, the remainder of foot the same as top colour. Wholly tan feet considered a greater fault than feet all same colour as top."
Breeding information below the pictures.
Silver grey tans are quite rare. It is quite difficult to breed silver grey mice even without the added difficulty of tan.
Silver grey tan may be produced by mating silver grey to black tan and continuing with careful selective breeding. Pearl tans are more complicated and could maybe be produced by mating silver grey tans with the lightest top to normal pearls.