
Abraum salts is the name given to a mixed deposit of salts, including halite (sodium chloride), carnallite, and kieserite (magnesium sulfate), found in association with rock salt at Aschersleben-Staßfurt in Germany. The term comes from the German Abraum-salze, `salts to be removed.` Abraum, which is red, is used to darken mahogany. ...
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http://en.wikipedia.org/wiki/Abraum_salts

• (n.) A red ocher used to darken mahogany and for making chloride of potassium.
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http://thinkexist.com/dictionary/meaning/abraum_salts/
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