Pins - How to?

[turtle]

100 +/- grams of plated pins. They have a steel spring inside the shaft, otherwise I think they are gold plated aluminum

Cell or AP?

The thought of using a cell for this is daunting, any suggestions?

 

[Barren Realms 007]

Take one and put it in HCL and see what kind of reaction you get and what color your solution turns. They could be aluminum but I don't think so odds are aginst it. They should be copper.

 

[g_axelsson]

It looks like test probes from a circuit board tester.

They are most probably made out of gold plated nickel, beryllium copper or stainless steel.
At least I can guarantee that they are not made out of pure copper or aluminium, it is too soft.

For examples see : http://tciinfo.com/index/bare.htm

/Göran