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Cotman, from the makers of Winsor & Newton Professional Watercolors, offers a selection of good-quality watercolors. The Cotman line includes both traditional pigments and reliable synthetic colors that replace some of the more rare and expensive pigments used in the Professional Watercolors.
Color Swatches created using heavy application/diluted application and were applied on cold press watercolor paper (150 lb) material.
nickel azomethine yellow
Nickel Azo Yellow is a transparent, moderately staining yellow pigment with high tinting strength. It is considered a good color match in botanical and landscape painting for natural gamboge (NY24), a historic yellow pigment with fair to poor lightfastness.
Nickel azomethine yellow has excellent lightfastness.
Nickel azo yellow pigment is mildly toxic, and is often labeled as hazardous. Avoid respiratory and skin exposure to pigment dust. It should be disposed of properly with other hazardous wastes, not washed down the sink. However, the contribution of artist pigments to levels of nickel metal complexes in the environment is almost insignificant. Nickel is often present in the environment naturally. Nickel is used heavily in steelmaking, and in many industrial processes and products.
Nickel azomethine yellow has been developed as an artist pigment becasue it is a close match for gamboge, a historic yellow.
Gamboge Hue, New Gamboge.
Quinacridone Red is a bright, clean red pigment with average drying time. Quinacridone pigments have relatively low tinting strength in general. For this reason, quinacridone colors are often expensive, because more pigment is required in the formulation.
Quinacridone Red has excellent permanence and lightfastness.
Quinacridone Red has no known acute hazards. Overexposure to quinacridone pigments may cause skin irritation. Quinicridone pigments contain a compound found to be a skin, eye, and respiratory irritant.
Although quinacridone compounds became known in the late 19th century, methods of manufacturing so as to make them practical for use as commercial pigments did not begin until the 1950s. Quinacridone pigments were first developed as coatings for the automotive industry, but were quickly adopted by artists.
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Material Safety Data Sheet
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