| http://www.w3.org/ns/prov#value | - LIQUIN (produced by Winsor and Newton).I wait as long as I can with this procedure, because Liquin must be rubbed very strongly with sharp nylon brush, and if the picture is fresh there is a risk of smudging some colors.Besides, the later you put it on the painting the slower it tarnishes and penetrates into the picture.Then it is allowed to photograph the painting, because then it has its surface
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