Winsor & Newton Professional Watercolor - Winsor Blue (Red Shade), Half Pan
Artists' Watercolor
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$7.99
Blick Art Materials · recorded Oct 21, 2026, 8:37 AM UTC
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Product details
- Blick SKU
- 00319-5630
About this product range
- The trusted choice of professional watercolorists since 1832
- Curated, travel-friendly sets in tube or half pan format
- Majority single-pigment formulations for optimal mixing
- Lightfast, permanent, and tested for color strength
Perfect for plein air painting, Winsor & Newton Professional Watercolors feature a thoughtfully curated selection of vibrant, luminous colors in either a tube or half-pan format. Each color offers unmatched clarity and depth—and more than half of the range is made of single pigments, ensuring clean, consistent mixing. The colors are carefully formulated for superior dispersion, lightfastness, and tinting strength so your work stays brilliant over time.
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 Blue
- Pigment code
- PB15
- Type
- organic
- Chemical name
- copper phthalocyanine
- Chemical formula
- C32H16CuN8
- Properties
- Phthalo Blues are pure and clean primary blues with superior covering power. They have a very high tinting strength and tend to overwhelm other pigments, but if color strength can be controlled, they make predictable mixed colors. In oil form, blues are very deep and slow drying. When mixed with other colors or if chlorine is added, Phthalo Blue quickly tends towards green. When using alone, mix with some white, as Phthalo Blue can be semi-transparent and almost black on its own. It is among the most compatible of modern colors with mineral colors and is considered more reliable than Prussian Blue, while sharing the same physical and color properties. Phthalo Blue is a good color for glazing.
- Permanence
- Phthalo Blues are completely lightfast and stable and are permanent for all paint uses. 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.
- Toxicity
- Phthalo Blues have no significant hazards, although those made before 1982 contained some PCBs (polychlorinated biphenyls).
- History
- Developed by chemists using the trade name Monastral Blue, the organic blue dyestuff now known as Phthalo Blue was presented as a pigment in November 1935 in London. Its discovery was accidental. The dark color was observed in a kettle where a dye was being made from a British dyestuff plant. The demand for such a pigment came from commercial printers who wanted a cyan to replace Prussian Blue.
- Description
- Bocour Blue, Cyan Blue, Helio Blue, Heliogen Blue, Intense Blue, Monastral Blue, Phthalocyanine Blue, Rembrandt Blue, Thalo Blue, Winsor Blue, Phthalo Blue (RS).
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