Building Materials
When a brick is immersed in water for 24 hours and then dried, if

No grey or white deposits appear on the surface, the brick is free from soluble salts
10 percent surface is covered with grey or white deposits, the brick has slight efflorescence
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

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Building Materials
Distemper is

A paint consisting of colored cement and water
A drying agent
A water proofing agent
A paint consisting of powdered chalk, pigments and water

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