Very low temp silver solder?

I want to make pendants using a combination of glass, copper tape and
solder. I've made them before but using lead free solder but I'd like to
step up and start using silver solder. What I'm after is something that I
can perhaps paint on somehow and then heat at a low temperature to set.
It's mostly for decoration so it doesn't need to be structurally sound!

Am I going mad, or have I seen a product like this?

Charlie.