The corrosion and conservation of artifacts made from lead, tin, and their alloys are described. Salts of weak acids may be removed by treatment with strongly acidic cation-exchange resins in deionized water and salts of strong acids may be removed by slow electrolysis in 5% NaOH. The metal objects are then impregnated with molten paraffin or microcrystalline wax. The ultrasonic treatment of lead is not recommended. Tin corrodes very readily and therefore ancient artifacts of pure tin are rarely met with, although lead-tin alloys are less readily attacked and occur relatively frequently. Badly corroded zinc may be treated with dilute HC1 followed by rinsing with dilute NH₃ and flnally with pure water. The occurrence of tin plague is discussed. -- AATA