Depending on what silvers you are talking about, They are out there. I have barred columbians in d'anver and barred silver duckwing (silver crele) in bantam phoenix. Both are very pretty. I love the barred pattern in all birds. I also have a couple barred white phoenix, but it is VERY hard to see, VERY hard, but it's there if you look close.
On those you mentioned if you use a male, that is suspect of being barred, yes he will pass it on.
Look at adult leg color as I mentioned go back and look at all the pic here of the barred birds. Notice how they all have pale or pinkish legs . And on chicks look for a white dot on top of the head. On your black boy, if he has it, it should be obvious in at least some of his feathering. The lavenders can be tricky depending on how much of it shows.