So you are looking for a wonder-drug to solve this problem
I really don't think there is any shortcut, or "easy way" to solve something like this amicably. The cop-out of course is to re-home one or more of the cats. Barring that, I think you need to start from the beginning. Were they ever getting along well? If so, what changed? If not, then what have you done to socialize them together?
There are cat behaviorists that work on these kinds of things, as well as lots of stuff on the internet, and good books like "cat vs cat". Not to mention numerous threads on this in this forum. Also people might be able to offer some helpful suggestions if you were to describe your cats and their history together. But I really don't think the answer here lies in the bottom of a bottle (unless the underlying cause is medical, like the silver one has been the alpha and is now sick or hurt and is now being challenged), and I think it will very likely take some hard work and patience on your part to reach a satisfying conclusion.