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How to Test for Lime in Ceramics With Acid

Lime refers to a number of inorganic calcium compounds that are produced from calcium carbonate. Lime is a strong base when mixed in solution and is used in many applications to raise pH, such as water quality control and gardening management. However, the presence of lime or other calcium compounds can be detrimental in ceramics and pottery due to chemical effects and the expansion of lime when it comes in contact with moisture. A simple acid test can determine if any of these compounds are present in a piece so that you can take proper precautions or discard the piece.

Things You'll Need

White vinegar
Dilute hydrochloric acid
Rubber gloves
Safety goggles
Paper towels

Instructions

- 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.

Rocks & Minerals