DIN 53770-12
DIN 53770-12 Pigments and extenders - Determination of matter soluble in hydrochloric acid - Part 12: Nickel content
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2007
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2007