Art Spectrum Artists’ Watercolours are produced in Australia from a mixture of high quality pigments and Gum Arabic.In accordance with proven traditional methods of production, all Art SpectrumArtists Watercolours are carefully stone milled to enhance the individual brilliance of each selected permanent pigment and to maximiseits handling qualities. Successful watercolours depend on selecting the best quality paper, the permanence and brilliance of the pigments and the use of a wide variety of quality brushes. Available in 10ml tubes. Series 1-4.