Quote:
Originally Posted by NortheastWind
I think for the brick they use walnut shells. Sand is a health and safety issue as sand is composed of silica which causes silicosis in the lungs.
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they don't sandblast anymore, they soda blast - its compressed air and baking soda - causes the grime on the surface to literally explode and vaporize on contact while not affecting the underlying layer. - walnut blasting will erode away the surface, sodablasting won't.
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