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SchminckePaints

Schmincke Horadam Aquarell Artist Watercolor - Indigo, Half Pan

Watercolor

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  • Blick Art Materials
    $9.17 USDShop
    Recorded Oct 21, 2026, 8:49 AM UTC

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Product details
Blick SKU
86319-5230
About this product range

Schmincke Horadam Aquarell Half Pans are individually optimized and formulated using the highest-quality pigments, water-soluble resins, and natural gums. Produced in Germany since 1881, the company is now owned by the fourth generation of the original family. Today the line includes an array of brilliant, intense, professional-quality colors — many of them with the highest lightfastness ratings of 4 or 5 stars. Smooth flowing and intermixable, colors that have dried on the palette can be reactivated with a wet brush.

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
PB15:1
Type
organic
Chemical name
alpha copper phthalocyanine
Chemical formula
C32H16CuN8
Properties
Phthalo Blue PB15:1 is a structural variant of Phthalo Blue PB15 that produces more reddish tones.
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
Phthalo Blue Red Shade, Winsor Blue Red Shade

Indigo

Pigment code
PB66
Type
synthetic, organic
Chemical name
2,2’-Bis(2,3-dihydro-3- oxoindolyliden)
Chemical formula
C16H10N2O2
Properties
Indigo is a deep blue pigment, almost violet dye that can be laked as a pigment.
Permanence
Indigo is fugitive. Indigoid Blue is the famous blue dye used in many blue jeans and other denim products, famous for the way it fades! Although a few paint manufacturers offer a genuine indigo color based on PB66, it should be used only for applications that are not permanent, or where the color is required for historic reasons. Most paint manufacturers replicate this historic hue with other more permanent pigments.
Toxicity
Although natural indigo is known to be mildly toxic, its toxicity is believed to be the result of other natural alkoids found in plant sources, not of the indigo dye itself. The acute and chronic toxicity of synthetic indigo dyes has been studied and has
History
Indigoid Blue is a synthetic version of Indigo, a famous dye and laked pigment that has been used since ancient times. The chemical compound that constitutes the indigo dye is called indigotin. More than 30 species of plants, found in many parts of the world, can be used to produce indigo dye. Indigo dye became the rage in Europe during the late Middle Ages. Although genuine indigo from plant sources is available, only the synthetic version is now used in commercial dye and pigment products. Genuine Indigo is designated NB1 (Natural Blue 1). The synthetic dye molecule was first synthesized by Bäyer in 1878, and it later became available as a commercial dye, quickly replacing natural sources.
Description
Indigoid Blue

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