Cotman Watercolors possess good transparency, excellent tinting strength and good working properties, including genuine cadmiums and cobalt. There are also a number of excellent water colour sets available in the Cotman range.

The range is chosen according to mass tone (colour from tube), undertone (bias of colour when in a thin film), colour strength, relative opacity and the character of the pigment itself. The resultant colour spectrum ensures the largest number of colours can be mixed.