Question: When a brick is immersed in water for 2 4 hours and then dried, if no grey or white deposits appear on the surface, the

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 per cent surface is covered with grey or white deposits, the brick has slight efflorescence
50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence
All the above.

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