What is "abraum salts"

Abraum \A*braum"\ or Abraum salts \A*braum" salts\, n. [Ger., fr. abr["a]umen to remove.] A red ocher used to darken mahogany and for making chloride of potassium. [1913 Webster] ||

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.