DIN 53770-9
DIN 53770-9 Pigments and extenders - Determination of matter soluble in hydrochloric acid - Part 9: Cobalt 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