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Old masonry wall with chalk and other impurities and with protruding bricks forming an irregular relief pattern Stock Photo - Alamy
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WITT it wipes off like chalk but appears on the brick randomly without explanation : r/whatisthisthing
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Family Cheers Up Neighborhood By Spending 6 Hours Coloring Each Brick of Their House With Rainbow Chalk
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Barnwell Braided Nylon Chalk Brick Building Line 100m Roll Size B Thicker : Amazon.co.uk: DIY & Tools
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