| http://www.w3.org/ns/prov#value | - Michel Sourgnes, an international art consultant, agreed with Mr Walker that using a rag to move materials, smudging or scraping did not mean that a picture was not a painting.Elizabeth Churcher, a former director of the National Gallery of Australia, said that where materials, including powder, were "suspended in a liquid such as water or varnish, then it became a painting
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