The story
From confusion of Kremnitz in Austria-Hungary (now Kremnica, Slovakia) with Krems, Austria, the actual location of the galena mines that previously produced exceptionally pure white lead.
Etymology from Wiktionary, CC BY-SA 4.0.
Kremnitz white
Today it means: Synonym of French white (“an especially pure form of lead oxide, particularly as used for paints.”). Full definition →