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Winsor & Newton Cotman Water Colors are a range of water colors that are made to our normal high quality standards but costs are kept to an economical level by replacing some of the more costly pigments with less expensive alternatives. Each color has good transparency, excellent tinting strength and good working properties. Lamp Black is one of the oldest pigments. It is made of pure carbon, originally from the residual soot of burnt oil lamps. It is a black with a bluish tint, producing a variety of cool blue greys.