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Incrusted bronze
MFA# 87.446


Brown crust on glass
MFA# 84.19

A hard covering or coat on the surface of another material. In minerals or metals, a crust or deterioration product of one, may be redeposited over another. Weathering may oxidize or deteriorate the surface of some materials forming a hard, sometimes protective, crust. A surface crust may also be formed by pollution or by low solubility salts, such as calcium sulfate, that form glassy, adherent films. See Black crust, Gypsum crust, Gypcrete, and Caliche.

Synonyms and Related Terms

crusting; incrustation; encrustation; black crust; gypsum crust; caliche; gypcrete

Additional Images

Resources and Citations

  • Dictionary of Building Preservation, Ward Bucher, ed., John Wiley & Sons, Inc., New York City, 1996