Building Materials
Veneering means

Carving out designs on timber planks
Thin layer of superior wood glued to inferior wood
Chemically treating timber planks
Thick layer of superior wood glued to inferior wood

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

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
All listed here
50 percent surface is covered with grey or white deposits, the brick has serious efflorescence

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