Bump
In photography, there is no substitute at all, because of the unique reaction of silver salts to light.
Interestingly, silver recovery from photographic processes used to be a fairly big business. But consumer film consumption has of course cratered, and this may make silver recovery no longer profitable here.
I am surprised that the segment of his industrial-use chart devoted to photography hasn't shrunk more. Maybe it's the motion picture industry holding it up. And of course even there, film will be going away sooner or later.