Building Materials
Distemper is

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

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

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

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