The sandy colour is what is known as tarnishing.
A silver cat is in reality a brown cat or a snow cat that has the silver gene.
In the case of the brown cat, the silver gene effect can be likened to a silver paint over the top of the cat's brown coat. Sometimes that "paint" is thinner in places and thus the brownish tones poke through, that is then called tarnish. Common on the face, the paws, the legs and the underbelly usually, but also occasionally on the spine of the cat and the body .
in Bengals, tarnish is quite common, because the silver genes have not been selected for, over many generations, like in some other breeds, where the cats show little tarnish. The quality of the silver is not only dictated by the silver gene itself but it can be enhanced by other interacting genes. It is those interacting genes you select for, by breeding silver to silver to silver to silver. Many bengal breeders breed silver to brown cats and the pedigrees of Bengal silvers are often full of brown cats, thus the offspring although silver can show tarnish.
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