Ironically, what would put lead in them.
Solder is traditionally a 60/40 mix (60% Tin, 40% Lead.) Because lead is bad bad bad you're gonna die, some manufacturers - especially in the cucked EU, specify 95/5 Tin/Antimony solder which looks like shit and flows like shit and is generally shit. It has other issues, but the biggest issue is it doesn't flow well and can give you a terrible joint. 60/40 solder is best, although some heathens specify 63/37 types.
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