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sonic cleaning machines



Dear List:
 
  In speaking with a researcher (a retired dentist) he inquired about using "ultra sonic cleaning machines," similar to what dentists use to clean their instruments, on items like old silver candlesticks.  I have not found any research on this and am asking if any of you have any ideas as to pro or con in terms of damage & preservation concerns.
 
Thanks,
Heidi Christein
Jewish Community Archives
Metro Detroit