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Historic:

"The Reichskulturkammer forbade artists such as Edgar Ende and Emil Nolde from purchasing painting materials. Those who remained in Germany were forbidden to work at universities and were subject to surprise raids by the Gestapo in order to ensure that they were not violating the ban on producing artwork; Nolde secretly carried on painting, but using only watercolors (so as not to be betrayed by the telltale odor of oil paint)"