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Formation of white crystalline substance which appears on the surface due to the presence of salts in materials used for making plaster is called as __________

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Formation of white crystalline substance which appears on the surface due to the presence of salts in materials used for making plaster is called as __________

(a) Cracking

(b) Crystallisation

(c) Efflorescence

(d) Crazing

I had been asked this question by my college professor while I was bunking the class.

My question comes from Terminology Used in Plastering Work in division Pointing and Plastering of Construction & Building Materials

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Right choice is (c) Efflorescence

The explanation is: Formation of white crystalline substance that appears on the surface due to the presence of salts in materials used for making plaster is called efflorescence. It results in a very poor and unpleasing appearance. It can be removed by washing the surface repeatedly.

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