Cotman Watercolours use fine art pigments with reduced pigment load than the Professional Watercolour range, making them an accessible choice while still uncompromising on quality. They are formulated to create uniform consistency, the transparent quality of Cotman Watercolours are perfect for new users. Rated AA and A for Excellent and Good lightfastness, Cotman Watercolours give artists the reassurance expected from a quality watercolour range. The range consists of 40 colours that possess good transparency, excellent tinting strength and good working properties. Cotman Watercolours are also available in 8ml tubes. Half Pans. Alizarin Crimson Hue is closely resembling genuine Alizarin Crimson. It is a transparent red pigment with blue undertones.