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Unformatted text preview: Colors sensitive to alkalis must not be used (a test is to shake samples in slaked lime and water and let stand a few days) Efflorescence occurs with house painter's ultramarine and English red because they contain gypsum Ripe buttery lime is best white, color strength and binding strength Grind colors fresh with lime-water that has stood for sometime and become clear - not with cloudy lime-water Wash brushes in lime-water while painting, rainwater or river water might have impurities and bring out rust spots Can add lime the size of hazelnuts to all colors if you wish - not in advance of painting for more than one hour Many paint red underneath blues The freshly painted section looks dark. This is because of the wet plaster. This is why it is sometimes hard to match the color to a dried piece of painting. As the plaster dries out it becomes very white and the colors look lighter and most lustrous....
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- Fall '10