Alloy Lead

tin/lead alloy questioon?

What proportion(in percent) is the best for making a tin/lead solder to use with plumbing (eg. solder copper piper together).
NOTE:please dont tell me that tin/lead solders for plumbing will be hazardous therefore dont use it, because its for an experiment. WEBSITE LINKS WILL GET THE 10 POINTS

pdf noted below
the bigger point here is that for piping work you do not want to use rosin flux solder materials

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