How to test if conductor is copper or silver based

In order to do the Density / Displacement test you need several things.....usually inaccessible to most persons.
1. Source of REALLY pure water. Distilled is best.
2. Temperature control. Everything should be at same temp.
3. Metler Balance or equivilent....a scale which goes to 5 or 6 significant digits.
4. A way to meaure extremely small volumes of water. 3 or 4 millilitres ought to do it.

Magfan - or 1000 banana plugs (just kidding).

Silver is currently ~10/oz.

If you paid less than that by Troy weight then for sure it is not pure silver.

You should be able to tell the difference between copper and silver by eye.

John C.