As used by Etsuko Mukoyama at You Can Make It 2020 in her Oriental Butterfly Filigree Pendant class - here is the Silver Solder Powder.
This very fine silver solder powder is ideal for soldering very fine detailed work, like filigree.
The size of powder is 100 mesh which is about 0.144mm - 0.149mm.
- 60% Fine silver
- 40% Copper and Zinc