| http://www.w3.org/ns/prov#value | - Having first observed the powerful chromatic effect of pure powdered pigment while in an art supply shop in London in 1949, through the 1950s Klein experimented with various fusions of asphalt, plaster, cement, sand, tar and other materials that he acquired from Edouard Adam, a chemicals and art supplies retailer in Montparnasse.
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