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Winsor & NewtonPaints

Winsor & Newton Professional Watercolor - Cobalt Blue, Half Pan

Artists' Watercolor

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  • Blick Art Materials
    $11.63 USDShop
    Recorded Oct 21, 2026, 8:37 AM UTC

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Product details
Blick SKU
00319-5180
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.

Cobalt Blue

Pigment code
PB28
Type
inorganic
Chemical name
cobalt(II) oxide + aluminum oxide
Chemical formula
CoO + Al2O3
Properties
Cobalt blue is a semitransparent pigment with low to moderate tinting strength. When it dries, it appears lighter and less saturated. Pigment particles are large and grainy. Differences in how the pigment is ground and mixed lead to considerable differences in its performance among various manufacturers.
Permanence
Cobalt blue is absolutely lightfast and extraordinarily stable. The stability of cobalt salts at high temperatures make them the standard for blues used in ceramics and glassware.
Toxicity
Cobalt salts are toxic. Avoid respiratory and skin contact. Soluble cobalt may cause irritation and allergic reaction through contact with skin. It is considered a possible carcinogen.
History
Since ancient times, smalt blue has been used to color glass and ceramics. Cobalt salts, which give smalt its characteristic blue color, were identified in the 18th century. Techniques for manufacturing Cobalt Blue, a chemically pure salt of cobalt and aluminum oxide, were developed in 1802.
Description
Smalt Blue

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