Colour Section: The Kennel Club (UK) Pomeranian Breed Standard

Colour
All whole colours permissible, but free from black or white shadings. Whole colours are: white, black, brown, light or dark, blue as pale as possible. Orange which should be self-coloured and bright as possible. Beaver. Cream dogs have black noses and black eye rims. Whites must be quite free from lemon or any other colour. A few white hairs, in any of the self-coloured dogs permissible but undesirable. Dogs (other than white) with white or tan markings highly undesirable and not considered whole coloured specimens. In parti-coloured dogs, colours evenly distributed on body in patches; a dog with white or tan feet or chest not a parti-coloured dog. Shaded sables should be shaded throughout with three or more colours, the hair to be as uniformly shaded as possible, and with no patches of self-colour. In mixed classes, where whole coloured and parti-coloured Pomeranians compete together, the preference should, if in all other points they are equal, be given to the whole coloured specimens.

There is a very interesting newly formed site on Facebook.  It is an  Educational Group about Pom colours, colour patterns and coat colour genetics. Amongst other things, It provides photographs of how coat colours can  changes from puppyhood through to adulthood.