The foundation of Winsor and Newton stems from the introduction of the worlds first moist water colours in the 1830s. Each colour within the range is specially selected to offer the greatest choice and flexibility ensuring all artists can obtain the palette that suits their work. Artists Water Colours are made from the finest pigments available in the highest concentrations possible consistent with good handling qualities. Specifications.. Cobalt aluminate Colour Index: PB 28 Extremely Permanent Semi-transparent Low Staining Power Granulates