FILE 15: GOLD AND GOLD ALLOY CONSERVATION
GOLD CORROSION
Gold is a relatively inert metal and thus undergoes
minimum corrosion. It is the copper- and/or silver-based gold alloys that easily corrode, resulting in silver or
copper corrosion compounds that leave an enriched and possibly weakened gold surface.
GOLD CONSERVATION
Pure gold and high gold alloys do not require
any conservation treatment. Gold objects from shipwreck sites appear to look the same when recovered as the day
they went down with the ship. The copper and silver in low- alloy gold do corrode. When present, the copper and/or
silver corrosion compounds of low-alloy gold are treated by the processes described for these two metals (see Files
12 and 13). Silver corrosion products
can be removed with ammonia; copper compounds with formic acid, citric acid, or alkaline sequestering agents, such
as Rochelle salts or alkaline glycerol. All the pertinent comments applicable to silver and copper conservation
are made under those headings.
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Copyright 2000 by Donny L. Hamilton, Conservation
Research Laboratory, Texas A&M University.
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