What makes a cat blue?

A "blue" cat is actually a type of grey coloration in cats, sometimes referred to as "blue-grey". The blue-grey coloration in cats is a result of a dilution gene, known as the dilute gene, which affects the distribution of pigment in the hair shafts of the fur. 


Extreme bred blue British Shorthair probably Russian bred
Extreme bred blue British Shorthair probably Russian bred. Photo in public domain

The dilute gene causes a reduction in the amount of pigment, particularly black pigment, in the hair shafts of the fur. This results in a dilution of the black coloration to a blue-grey color, while the other color pigments (such as red and yellow) remain unchanged. 


Blue-grey cats can come in a variety of breeds, including the Russian Blue, British Shorthair, and Chartreux. It's important to note that the blue-grey coloration is purely cosmetic and does not affect the cat's behavior or health in any way.

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