Is there a test to determine whether solder is leaded or lead-free? Perhaps conductivity/resistance?
Electronic – How to identify lead-free solder if it’s unpackaged
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Best Answer
Lead-free solder has a much higher melting point than leaded. If you have a soldering iron and some leaded solder, set your iron to a temperature where it just melts the leaded stuff. Then, try heating up a component on the board at that temperature (make sure it isn't connected to a large copper pour).
If you're having trouble getting the solder to melt, there's a good chance that it's lead-free.