How to Test for Lime in Ceramics With Acid
- 1). Dampen a corner of a paper towel with white vinegar. Dab the vinegar onto an inconspicuous area of the piece -- if there is significant bubbling activity, then there is likely lime or another calcium compound (such as limestone) present in the material. Use dry paper towels to wipe away the vinegar.
- 2). Apply several drops of dilute hydrochloric acid to an inconspicuous area of the piece if vinegar did not produce bubbles -- significant bubbling likely signifies the presence of lime or another calcium compound in the material.
- 3). Wipe away the lingering dilute hydrochloric acid with a dry paper towel. Dispose of the paper towel in a secure garbage can and thoroughly wash your hands.