Difference between revisions of "Naphthol pigment"

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== Other Properties ==
== Physical and Chemical Properties ==
Resistant to acid, alkali and soap.
Resistant to acid, alkali and soap.

Revision as of 08:20, 30 October 2020


A general class of azo-type organic colorants. Naphthol pigments contain a backbone of 2-hydroxy-3-naphthanilide (Napthol AS) and include many shades of red and some oranges. They were first patented in 1911 and sold as Grela Reds but did not become popularly used until the 1930s. About 6% of the red colorants used in 1985 were naphthol pigments. They provide good tinting strength and good lightfastness, but can bleed when exposed to organic solvents. Naphthol reds are used to color plastics, automotive finishes, architectural paints, pencils, crayon, printing inks and inexpensive artists oil paints and watercolors. See also Beta naphthol pigment.

Synonyms and Related Terms

naphthol dye; azoic dye; Naphthol Red; Permanent Carmine; Grela Red; napthol dye (sp); hydroxynaphthoic anilide; Naphtol Anilid Saure (Deut.); Napthol AS (Deut.); pigment à base de naphtol (Fr.);


PR5 Monolite Red CB.PNG


PR9 kremer23290-b.TIF


PR017sun naphtol red medium 235-7515.TIF


PR022 sun naphthol red light 235-7511 (with kaolin).TIF


PR023 Sun Naphthol red dark.PNG


PR146 naphthol Red FFB (magruder ra1308-dc).TIF


PR170 sun naphthol red 235-0170.TIF


PR266 Naphthol Red.PNG


PR268 Naphthol Red.PNG


PR269 Naphthol Red.PNG


Pigment number Manufacture Pigment name Manufacture CI number Comments
PR005 unknown monolite red CB unknown
PR009 Kremer unidentified 23290
PR017 Sun napthol red medium 235-7515
PR022 Sun napthol red light 235-7511
PR022 Magruder napthol red light shade ra1307-dc
PR023 Sun napthol red dark 235-7575
PR146 Magruder napthol red FFB ra1308-dc
PR170 Sun napthol red 235-0170
PR170 Kremer napthol red 23290-a
PR266 Magruder napthol red medium shade ra1014-dc
PR268 Magruder napthol red warm light shade ra1012-dc
PR269 Magruder napthol red bluish dark shade ra1087-dc

Physical and Chemical Properties

Resistant to acid, alkali and soap.

Additional Information

B.Berrie, S.Q.Lomax, "Azo Pigments: Their History, Synthesis, Properties and Use in Artists' Materials" in Studies in the History of Art, No.57, National Gallery of Art, Washington DC, 1997.

Sources Checked for Data in Record

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993 Comment: Napthol AS = azoic couplic component
  • Hoechst Celanese Corporation, Dictionary of Fiber & Textile Technology (older version called Man-made Fiber and Textile Dictionary, 1965), Hoechst Celanese Corporation, Charlotte NC, 1990
  • Rosalie Rosso King, Textile Identification, Conservation, and Preservation, Noyes Publications, Park Ridge, NJ, 1985
  • Fairchild's Dictionary of Textiles, Phyllis G.Tortora, Robert S. Merkel (eds.), Fairchild Publications, New York City, 7th edition, 1996
  • Encyclopedia Britannica, http://www.britannica.com Comment: "Chemical Compound." Encyclopædia Britannica. 2004. Encyclopædia Britannica Premium Service. 13 May 2004 . gives date os first use as 1912
  • B. Berrie, S.Q. Lomax, 'Azo Pigments: Their History, Synthesis, Properties and Use in Artists' Materials', Studies in the History of Art , National Gallery of Art, Washington DC, No. 57, 1997 Comment: patented 1911

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