Dale,
per PocketRef, 2nd Ed.
"Silver solder" for electrical applications (soft solder) has no silver, it is 67% tin, 33% lead.
Silver solder (hard) is 10% zinc, 20% copper, 70% silver.
True silver solder is difficult to bend and is sold as rodstock. Soft "silver" solder is easily bent and is sold wound or in spool form. Silver electrical solder melts at a low temperature, it can be tinned with a tinning iron. Hard silver solder melts at a much higher temperature and must be brazed, commonly with an oxy-acetylene torch.
Sid Smith "who has a silver soldered Benotto piste" Lake Forest, IL