I would avoid introducing these low temp solders.
Why cheapen the work with something that will be difficult to repair. The tin and other low temp metals can easily contaminate the silver and your work.
The best firescale/firestain preventer I've ever used is Dr. Fran's Fabulous Flux. It's non-toxic and will protect your brazing up to 1,800 degrees! Siunce my primary business is silver restoration, I have to be most careful with the surface finish.
The flux is made by:
Contains boric acid—sprayed on warmed objects, removed with warm water,
compatible with Superior #6 Brazing Flux.
Paul H. Gesswein & Co., PO Box 3998, Bridegport, CT 06605, 800/243-4466
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I want to do some brazing of bezels on hand engraved pieces. Since engraving is easiest in the flat stage with no bezel in the way i chose to braze after engraving. My question is anybody had any experience with firescale coatings like riogrande sell.I do not want to have to polish much after brazing. I have used boric acid and alcohol with limited success.