I increased sample sizes to about 3cc of 32% HCl and about 30 cu-mm of
solder wire. About 1/3 of the wire scraped into scrapings and remainder
added as round and the part round remnant . After boiling and cooling twice
then perhaps about 5 to 10 cu-mm of KI added and repeated boiling and
cooling. For the leaded one bright orange crystals? soon appear on forced
cooling and flecks of glistening gold colour the second time of heating
cooling after KI . The glistening gold agrees with my chemistry book for
lead testing with KI, don't know about the orange. The colours and crystals
disappear on boiling.

The lead free one , no colours at all in the liquid but the metal goes
black. With repeated boiling then still a lot of gas comes off the metal for
some time after removing from the heat , unlike the leaded sample. Maybe
acting on the 5 percent silver content.


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm