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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. Winsor Emerald is a bright clean opaque emerald color. First documented in 1822, it originally contained arsenic and is said to have killed Napoleon as his wallpaper in St Helens was emerald green. Winsor & Newton have created a non-toxic version closely matching the original color.