El Greco Iconography Pigment - Cadmium Red Medium - 100gr

• Manufacturer
  El Greco
• Product Type
  Dry Pigments
• Barcode
  5212016643576
• Color Family
  Red
• Paco code
  8311347
• No.
  27
• Color Name
  Cadmium Red Medium
• Size
  100gr
• SKU
  ELGREC-400.100-27
• Description
  Dry Pigment

Πληροφορίες Χρωστικής

• Pigment Name
  PR170-Naphthol Red
• Pigment type
  organic, naphthol AS
• Chemical Name
  -
• Chemical Formula
  C26H22N4O4
• Properties

  Pigment PR170 is a bright deep red with bluish undertones. It has an average drying time. It has two crystaline forms that differ significantly in opacity. The more transparent form (F5RK) tends to be more bluish and is less lightfast.

• Permanence

  The lightfastness and weatherfastness of Pigment PR170 varies, depending on the application and the crystaline form. The opaque form (F3RK) has very good lightfastness, and is more weather resistant. The transparent form (F5RK) has lightfastness that is considered acceptable in pure applications, but it fades more in tints. Neither form is considered suitable for exterior use.

• Toxicity

  -

• History

  Naphthol pigments are actually dyes that are laked to form pigments. First developed by the German chemical company Hoechst A.G. before World War I, their use in artist paints began in the 1920s. Pigment Red PR170 is a Naphthol AS pigment, chemically related to the diarylide yellow pigments. The Naphthol AS pigments comprise a range of reds. They are used in plastics, textiles, and printing inks.

• Pigment Name
  PR254-Pyrrole Red
• Pigment type
  organic, aminoketone
• Chemical Name
  Bis-(p-chrolopheny)-1. 4-diketopyrrolo(3. 4-c)pyrrole
• Chemical Formula
  -
• Properties

  Pyrrole Red is opaque and has strong covering power. According to manufacturer Ciba, which uses the trade name Irgazin Red, it is a “clean, highly saturated mid shade red with high temperature resistance, excellent color strength, outstanding chemical, solvent and bleed resistance, and good weatherfastness.

• Permanence

  Pyrrole Red is considered to have excellent lightfastness among organic pigments in its class. Tests in industrial applications have given it scores of 7-8 on the Blue Wool Scale.

• Toxicity

  According to the Australian government's Ministry on Health and Aging, The notified chemical exhibited low oral and dermal toxicity in rats, did not exhibit toxic effects when administered orally to rats for 28 days, was not a skin irritant in rabbits.

• History

  Pyrrole Red, used as an automotive paint and as a colorant in plastics, was developed as one of a range of pigments to replace lead based pigments. In art materials, it is often used as a synthetic and lightfast replacement for carmine, a laked pigment that was originally produced from the body of the cochineal insect. It is also used to replace the older naphthol reds, organic red pigments that are sometimes only marginally lightfast and weatherfast.

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