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SchminckePaints

Schmincke Horadam Aquarell Artist Watercolor - Indigo, 15 ml tube

Horadam Aquarell Artist Watercolor

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  • Blick Art Materials
    $18.45 USDShop
    Recorded Oct 22, 2026, 12:47 AM UTC

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Product details
Size
15 ml
Blick SKU
00323-5201
About this product range
  • Professional quality
  • 140+ colors
  • Individually milled with finest quality pigments
  • Kordofan gum arabic
  • Exceptional re-wetting properties

Schmincke Horadam Aquarell Watercolor Tubes are crafted for the most vibrant and professional results. Since their first patent in 1892, they've been continually refined for over a century to deliver unmatched quality. Made with the finest artist pigments, these smooth, creamy colors glide effortlessly glide across any watercolor paper. Each of the 140+ stunning colors is individually milled to perfection—offering a consistently exceptional experience for every artist.

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.

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

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

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