Color Swatch created using heavy to light application and was applied on 100 lb (163 gsm) drawing paper material.
This color contains the following pigments:
PR188 —Naphthol Red
Pigment Type
organic monoazo
Chemical Name
n/a
Chemical Formula
C33H24Cl2N2O6
Properties
This Naphthol Red is yellowish, with a high tinting strength and average drying time. It produces warmer shades and tints.
Permanence
This Naphthol Red has excellent lightfastness, though it is generally not considered adequate for exterior use.
Toxicity
Naphthol Reds are not considered toxic. They may cause eye, skin, or respiratory irritation. Contact with dry pigment should be avoided.
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.
Alternate Names
Naphthal, Naphthol Bordeaux, Naphthol Carbamide, Naphthol Carmine, Permanent Carmine, Permanent Red.
PR242—Pigment Red 242
Pigment Type
organic, disazo condensation
Chemical Name
n/a
Chemical Formula
n/a
Properties
A bright yellowish red, often referred to as scarlet. It has average tinting strength.
Permanence
It has excellent resistance to solvents, acids, and alkali, and is heat stable up to 300°C. Disazo condensation compounds have very good lightfastness for organic pigments.
Toxicity
n/a
History
Pigment Red 242 is used to color plastics, paints, and printing inks.
Alternate Names
Fast Scarlet, Sandorin Scarlet
PR3—Toluidine Red
Pigment Type
organic, monoazo
Chemical Name
n/a
Chemical Formula
n/a
Properties
Toluidine Red is a semi-opaque, yellowish red pigment with high tinting strength. .
Permanence
Toluidine Red has very good lightfastness.
Toxicity
Toluidine Red is not regarded as toxic.
History
Toluidine Red or Toluidine Scarlet has been used in inks, textiles, artist materials, and plastics.
Alternate Names
Eljon Red, Eljon Scarlet, Hansa Red, Hansa Scarlet, Kenalake Scarlet, Solintor Scarlet, Sunbrite Red
