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Blockx Soft Pastel - Cobalt Blue 535
Soft Pastel
Recorded retailer price · not live
$6.16
Blick Art Materials · recorded 2026-10-21T05:07:36.328377000Z
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Product details
- Blick SKU
- 21918-5535
About this product range
Blockx Soft Pastels are handmade in Belgium using pure pigments in the same tradition started by company founder and chemist Jacques Blockx in 1844. Four subsequent generations of Blockx family members have combined traditional methods with modern chemistry to create artist's colors that are pure, permanent, lightfast, and stable.
Colors are named in such a way as to make it easy for artists to choose the exact shades they need. For example, Apple Green's five shades are: Apple Green 641, Apple Green 642, Apple Green 643, Apple Green 644, and Apple Green 645.
If the color name ends in:
- 1 — the pure color is upgraded with black
- 2 — this is the pure color
- 3 — the pure color is tinted with white
- 4 — the pure color is tinted with more white
- 5 — the pure color is tinted with much more white
These watersoluble pastels are soft and velvety in texture, possess a superb tinting strength, and will draw on any surface, although they're best-suited for pastel paper.
Individually wrapped pastel sticks are 2-1/2" L x 1/2" Dia (65 mm x 12 mm).
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
Ultramarine [Blue]
- Pigment code
- PB29
- Type
- inorganic
- Chemical name
- complex silicate of sodium and aluminum with sulfur
- Chemical formula
- Na8-10Al6Si6O24S2-4 or Na6-8Al6Si6O24S2-4
- Properties
- Ultramarine is the standard warm blue, a brilliant blue pigment that has the most purple and least green in its undertone. It has a moderate to high tinting strength and a beautiful transparency. Synthetic Ultramarine is not as vivid a blue as natural Ultramarine. Ultramarine dries slowly in oil and tends to produce clean, though granular, washes in watercolor. French Ultramarine mixes well with Alizarin colors in oil and watercolor form to create a range of purples and violets. It can dull when mixed with white in acrylic form, but mixes well with other colors. The shade varies based on manufacturer. Considered a great color for glazes, it is not suitable for frescoing.
- Permanence
- Ultramarine has excellent permanence, although synthetic Ultramarine is not as permanent as natural Ultramarine. It may discolor if exposed to acid because of its sulfuric content.
- Toxicity
- Ultramarine has no significant hazards.
- History
- The name for this pigment comes from the Middle Latin ultra, meaning beyond, and mare, meaning sea, because it was imported from Asia to Europe by sea. It is a prominent component of lapis lazuli and was used on Asian temples starting in the 6th century. It was one of the most expensive pigments in 16th century Europe, worth twice its weight in gold, and so was used sparingly and when commissions were larger. Ultramarine is currently imitated by a process invented in France in 1826 by Jean Baptiste Guimet, making blue affordable to artists and extending the range of colors on their palettes.
- Description
- Artificial Ultramarine, French Blue, French Ultramarine, Gmelin's Blue, Guimet's Blue, Permanent Blue, Royal Blue, Synthetic Ultramarine. New Blue describes particular shades of Ultramarine. Armenian Blue and Lazuline Blue are names for genuine Lapiz Ultramarine. Sky Blue is a pale tone of Ultramarine.
Cobalt Chromite Blue Green Spinel
- Pigment code
- PB36
- Type
- inorganic
- Chemical name
- Oxides of Cobalt and Chromium
- Chemical formula
- Co(Al,Cr)2O4
- Properties
- Cobalt Chromite Blue is an opaque pigment with moderately low tinting strength.
- Permanence
- Cobalt salts have excellent lightfastness and temperature stability.
- Toxicity
- Cobalt salts are toxic when ingested or inhaled, and slightly toxic on contact with the skin. Evidence of Chromium(III) carcinogenicity is inconclusive. Chromium(III) salts appear in greenish pigments.
- Description
- Cobalt Turquoise, Shepherd Blue, Cerulean Blue Chromium
Related supplies
- Blockx Soft Pastel - Cobalt Blue 531
- Blockx Soft Pastel - Cobalt Blue 532
- Blockx Soft Pastel - Cobalt Blue 533
- Blockx Soft Pastel - Cobalt Blue 534
- Blockx Soft Pastel - Blockx Blue 501
- Blockx Soft Pastel - Blockx Blue 502
- Blockx Soft Pastel - Blockx Blue 503
- Blockx Soft Pastel - Blockx Blue 504
- Blockx Soft Pastel - Blockx Blue 505
- Blockx Soft Pastel - Ultramarine Blue 511
- Blockx Soft Pastel - Ultramarine Blue 512
- Blockx Soft Pastel - Ultramarine Blue 513