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Cleaning of Ivory/ Bone

Oppi Untract’s Jewelry Concepts and Technology gives a formula of
ammonia and acetone for cleaning old ivory. I seem to remember
cleaning piano keys with milk. Does anyone have another formula
for cleaning old necklaces of ivory or bone? Thanks. Bill in Vista
with our first seasonal rain.

Bill, I used to clean my piano keys with a solution of vinegar
and water. It cleans but will not remove any yellowing (which, I
believe, is permanent once it occurs). Jan