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I own a brownstone in Bed Sty. The common interior wall which the staircase runs up has exposed bricks. They’ve been sealed (you can tell because they are shiny). But, on the second floor some of the bricks literally crumble when you touch them, but in to a very fine white powder. These are not white bricks… they are natural/red color. I have no idea what this could be. Does anyone have an idea?