“Rusting” of black cats
If you own a sleek black car, you know it isn’t going to stay very sleek if you leave it outside where it will experience all kinds of weather. In effect the same thing happens to black cats, specifically the long-haired ones. If exposed to the elements—including sunlight—a longhaired black cat’s fur tends to “rust”—not literally the rust that forms on iron, but the effect is the same in that the cat’s hair turns a kind of reddish-brown. It’s bound to happen to any black longhair who spends a lot of time outdoors. Needless to say, folks who exhibit their pets in cat shows are fussy about keeping black longhairs indoors and away from too much sun.