| http://www.w3.org/ns/prov#value | - A filter paper was impregnated with this solution and dried at 30??? C. A part of the treated paper was exposed through a filter (UV39) to visible light of 50,000 luxes from a tungsten lamp repeatedly while changing the exposure times variously such as 4, 8.5, 12.5, 30 and 40 seconds.
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