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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. Burnt Sienna is a rich brown pigment made by burning Raw Sienna. Named after Siena in Italy, where the pigment was sourced during the Renaissance, it is a transparent pigment with red-brown tones.