Winsor & Newton Cotman Watercolor - Emerald, 21 ml

Name: Winsor & Newton Cotman Watercolor - Emerald, 21 ml
Brand: Winsor & Newton

Cotman Watercolors

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$8.02

Blick Art Materials · recorded Oct 21, 2026, 11:26 AM UTC

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Product details

Size: 21 ml
Blick SKU: 00325-7052

About this product range

Quality student-grade range
40+ colors, including modern and historic pigments
Strong tint strength
Reliable transparency and lightfastness
Uniform consistency for beginners and students

Cotman Watercolors offer Winsor & Newton's renowned quality at an accessible price for students, beginners, and budget-conscious artists. Available in 8 ml and 21 ml tubes, the range features over 40 colors carefully selected for their tone, undertone, strength, and versatility in mixing.

Formulated with a blend of traditional and modern pigments—from natural earths to vibrant organic pigments—these colors allow for a variety of effects, from easy lifting to subtle washes to expressive, high-staining color. Most colors are transparent, with a smooth, consistent texture that makes them easy to work with, especially for those just starting out.

To keep the range affordable, a few of the more expensive pigments have been replaced with cost-effective alternatives—without sacrificing performance. With good to excellent permanence ratings, Cotman tubes are a reliable, affordable option for anyone looking to build a versatile palette without compromise.

Pigment information

General reference notes about pigments can describe other media (such as oil). They do not verify this product’s exact formulation or behavior.

Phthalo Green

Pigment code: PG7
Type: organic
Chemical name: polychlorinated copper(II) phthalocyanine
Chemical formula: C32H3Cl13CuN8 to C32HCl15CuN8 or C32H16CuN8Cl15 (PG7) or C32Br6Cl10CuN8 (PG36)
Properties: Phthalo Green is a transparent, cool, bright, high intensity color used in oil and acrylics. It comes from a Phthalocyanine Blue pigment where most of the hydrogen atoms have been replaced with chlorine, forming highly stable molecules. It has similar pigment properties and permanence to Phthalo Blue. It is slow drying and an excellent base color for mixing a range of bright greens. Phthalo Green is considered a very good alternative to Viridian because it is intense and mixes well and can be used to emphasize mineral colors in various tints. However, its tinting strength is very high, so it can overpower other colors. This pigment most closely resembles the discontinued and toxic Verdigris.
Permanence: Phthalo Greens are completely lightfast and resistant to alkali, acids, solvents, heat, and ultraviolet radiation. They are currently used in inks, coatings, and many plastics due to their stability and are considered a standard pigment in printing ink and the packaging industry.
Description: Bocour Green, Cyan Green, Intense Green, Monastral Green, Phthalocyanine Green BS, Rembrandt Green, Thalo Green, Winsor Green.

Benzimidazolone Yellow

Pigment code: PY175
Type: monoazo
Properties: Benzimidazolone Yellow is a bright yellow, semi-transparent pigment, slightly greenish, with dull tints and an average drying time.
Permanence: Benzimidazolone Yellow has excellent lightfastness.
Toxicity: Benzimidazolone Yellow is not considered toxic.
History: The benzimidazolone group of pigments was developed and patented in 1960 by Hoechst A.G., a German chemical manufacturer that was a forerunner of the pharmaceutical company Aventis.
Description: Benzimidazolone.