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The white surface salts that disfigure new brickwork are derived from the mortar the bricklayer joined the bricks with. These salts are moved through the brick by capillary action. Sometimes, bricks are wetted before use to minimise this effect.
The efflorescence as it is known, will gradually disappear with weathering.
The addition of long-chain fattty acids (water extenders) to the mortar will help minimize the effect.
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