Winsor & Newton Cotman Water Colours are a range of water colours 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 colour has good transparency, excellent tinting strength and good working properties. Intense Green (Phthalo Shade) is a brilliant transparent green pigment with a yellow undertone. A modern pigment, it was introduced in 1930s.