Where To Find Silver ?

Originally Posted by patnor1011

Poormans test is simple. Take sheet of paper and rub suspected silver on it. If you will see gray streak then it is tin.

How will you use that on a circuit board ?

How do you mean circuit board? If you are not sure about part then clip it off and test. Circuit board will not have silver directly plated on itself. Even keyboards mylar silver is not silvery white metallic silver but rather grey silver paste printed on it.
If you want to find out if your solder is tin/lead or tin/silver solder then silver solder is bit brittle than lead. Generally new electronics do not have tin/lead solder anymore.