Well most of older stuff was a mixture of lead and tin. But since lead is bad for you there are lead free solders available. Problem is that leadfree IMO works like crap. Go figure, something that works great is bad for you., and soemthign that is good for you works like crap.
So now they all modern electronics is moving towards RoHS compliant components and solder.
Lead-free solder requires a higher melting temp so its harder to work with.
I Still choose to use 60/40 tin/Lead mixture solder because it works great. There are so many other things that can kill me in this world I don't care. Just don't breathe in the fumes. That's what I say.



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