Art Spectrum Artists Watercolour Paint Aureolin S4Art Spectrum Aureolin, also known as Cobalt Yellow, is a more muted yellow that is slightly warmer than Spectrum Yellow. Aureolin is transparent and allows tinting with ease due to its low strength. In accordance with proven traditional methods of production, all Art Spectrum Artists Watercolours are carefully stone milled to enhance the individual brilliance of each selected permanent pigment and to maximise its handling qualities. Successful