I can confirm that Jen's Capri is a bi-color. I do have a Capri son Apache, who himself is sable, but carries the bi-color gene as evidenced by a bi-color pup in my litter from him and Tunguska (sable/black recessive).
There is a genetic difference, unlike "black sable" (which doesn't exist)...sable is sable is sable, genetically. Bicolor and black and tan have different genetics, apparently, though Czech, Slovak, and German registries do not differentiate like AKC does.
Elkoor, I look at colors based on the breed survey color recognition.
Jenni, maybe when I am bored one day at work I will look at the genes that code for the differences in color expression.
And another question : I am that lazy to look for it myself, is so described bi-color a completely different set of amino acids or is a some sort of mutation on a black and tan sequence.. or "black"color coding sequence.