Is this the right coat on a silver-shaded (British Shorthair) cat’s back?

Hello, from the photo this is not a silver-shaded (Yin Jian Ceng) coat trait. The pure silver-shaded’s most notable feature is the tipped fur: on the back, head, tail, and outer legs the fur is white at the base and black at the tip, called the ‘tipped’ pattern, giving an even gradient and an overall pale silver-white look.

Of course, the overall color varies with the amount of black in the tips: more black means a deeper overall color, and vice versa.