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Manganese Blue was a blue-green pigment from the mid-20th century. While it was most popular as a watercolor, landscape painters, including Robert Gamblin, prized this mineral pigment (barium manganate on a substrate of barium sulphate) because it is a rare cool blue and has a low tinting strength. By the early 1990's, the manufacturer of Manganese Blue stopped production because the German government required the company to reduce the toxicity of the manufacturing process. Rather than retro-fit the factory, the manufacturer stopped making this pigment. Because Manganese Blue is important to his own painting, Robert immediately made an excellent copy of the color. Gamblin Manganese Blue Hue is more transparent and that is a plus. A cool, transparent blue with green undertone especially useful for painting sky and water. Pigment: Copper phthalocyanine (PB 15:4), Vehicle: Alkali refined linseed oil, Lightfastness I, Series 2, Transparent
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