... just what is that grey or brown stuff in the crazing lines of my 1920's
ceramic (full earthenware - not glazed iron) bathroom fixtures.  Does the
darker stuff signal an internal chemical change (e.g. exposure to air or
moisture) or is it waterborne deposit from 'washing my hands in dirty water'?


And, has anyone figured out how to remove it?

Christopher Gray
Office for Metropolitan History
246 West 80th Street, #8, NYC  10024
212-799-0520  fax -0542
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