The breed experienced a very hard start out because of minimal genetics. From the seventies, breeders paired the hairless cats born in individual litters in Toronto and Minnesota (named Epidermis, Punkie, and Paloma) with Devon Rex cats, a breed with a very sparse hair coat. There are plenty of illustrations https://remingtonuiryd.blogdigy.com/getting-my-russian-blue-to-work-53708618