A person on the Post-Adoption Cairn Rescue forum posted a link on Cairn Terrier colors from Lachleen Cairn Terriers that is quite good.
Note: “It is almost impossible to give exact colors of the puppies when they are young.”
“According to the Danish Kennel Club rules we have to register the pups only 3 weeks old, and at that point getting the colors correct is pure luck. Breeding for colors will take you nowhere, like picking the pup because of the color will be of no use.”
To read this post on the Lacheen website, click HERE