A technical dictionary of printmaking, André Béguin.
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Dutch mordant
An acidic etchant used with copper, made up from hydrochloric acid and potassium chlorate. (Electro-etch). check also attacking agents and mordant
According to Béguin the Dutch mordant of Rembrandt had the following ingredients:
1 ltr. water
125 cm3 of hydrochloric acid
25 gr potassium chlorate
25 gr table salt
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