Ceramic Soluble Salts

How bad can efflorescence of soluble salts of fired ceramic surfaces be.

Ceramic soluble salts.

This terra cotta clay vitrifies here at 1957f cone 03. Barium carbonate can be used to precipitate the salts inside the clay matrix so they do not come to the surface on drying. Mark goudy and liza riddle are a couple from berkeley california who are blazing a new frontier in ceramic arts with their explorations into the applications of soluble metal salts. I suppose it could almost be expected with backgrounds covering photography biology engineering chemistry music and graphics and a love of the outdoors that their work in ceramics would be organic technical.

Feb 16 2020 explore ceramic art community noticebo s board water soluble metal salt effects followed by 1601 people on pinterest. The water dissolves the salt and draws it out of the ceramic. The changing from soluble to crystallization and back damages the surface of the ceramic because salt crystals are larger than liquid salt and therefore will shrink and expand the ceramic body. The most common method of removal is by soaking the ceramic in deionized water for extended periods of time.

Soluble salt compounds may be introduced into the ceramic pores from ground water agricultural run off seawater or other sources. In high humidity salts become soluble and in low humidity they crystallize. This problem is common in many terra cotta materials but can also surface in others. Soluble salts respond to changes in humidity both high and low.