In accordance with proven traditional methods of production, all Art Spectrum Artists' Watercolours are carefully stone milled to enhance the individual brilliance of each carefully selected pigment, and to maximise its handling qualities. Art Spectrum watercolours have the distinct advantage of being composed only of lightfast pigments - for instance, Alizarin Crimson is not offered in our range because it is known to be fugitive. We have replaced this colour with a lightfast Permanent Crimson. Art Spectrum watercolours have a very high pigment content - no fillers are used - and thus give stronger tints and clean mixes. This fact, combined with the large 7.5ml tubes, provides the watercolourist with outstanding value for money.

Watercolour Mediums Art Spectrum Ox Gall Traditional wetting agent for watercolour. A drop or two in water with gouache or watercolour gives extra flow and good adhesion. Do not put brushes in Ox Gall as this may introduce bacteria. Will clean paper prior to painting by removing greasy finger marks. Art Spectrum Gum Arabic Gum Arabic is the binder for watercolour. It is also used as a medium to help keep diluted watercolours  from sinking below absorbent surfaces. Gives a crisp appearance to watercolour edges. Increases transparency and gloss and controls spread when overpainting wet on wet. Art Spectrum Masking Fluid A rubber, latex solution which is painted over any area you wish to keep free of colour. When dry, the solution is removed by gently rubbing with the finger or using a crepe 'pickup' eraser. USE  COLOUR SHAPER BRUSH FOR ease of application.