wainscot
A cover marble executed by first painting the
covers with a brown coloring and then water,
followed by splashes of copperas (ferrous
sulfate). A solution of alum is then thrown on,
followed by a bold sprinkle of dilute sulfuric
acid. An alternative "wainscot" consists of brown,
a coating of glair, black in large spots, brown
again, this time in large spots, and finally the
dilute sulfuric acid. (95 , 97 , 152 )
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