#solder  an alloy (usually of lead and tin) used when melted to join two metal surfaces
  supertype:  #alloy__metal  a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten; "brass is an alloy of zinc and copper"
  subtype:  #hard_solder  solder that contains copper; melts at a relatively high temperature; used for brazing
  subtype:  #silver_solder  a solder that contains silver
  subtype:  #soft_solder  solder that melts at a relatively low temperature

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