When breeding Russian Blues: only blue RUS shall be used and only blue progeny from blue RUS parents can be registered as Russian Blue (RUS). Shorthair progeny in a colour variety other than blue must be registered as XSH*
Russian Blues in CFA are recognized as a natural breed and are registered in one colour: blue.
The FIFe shall not recognize any colour variety other than blue in the Russian Blue. The FIFe will not encourage any person or federation to produce colours other than blue in the Russian Blue.