Powder puff? The SoP calls strictly for clear bluish slate with a distinctly black lacing. There is no variance of that. You can like what you like, but if you breed to perfection then you have set standards already in place. No lacing is a cull unless you breed for your own looks. Its not bettering the breed in any way.
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Nice points about the blue variety of sumatras.NWSumatras asked about colour per the Standard Of Perfection, not about anyone's personal preferences. The Standard clearly describes what the colour should be. The description for all Blue varieties is the same, Sumatras don't have a seperate colour description.