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|Archive reference number||NGA34/1|
Typescript paper titled 'Technical testing methods and Van Gogh falsification: Retrospections on the Wacker case'
Outlines the 'Wacker Case', whereby art dealer Otto Wacker sold c.30 paintings as being by Van Gogh. The paintings were subsequently discovered to be forgeries. Also gives details of technical investigations of the paintings, including the use of X-Ray. No author or date given, possibly written by Helmut Ruhemann.