Color Swatch created using heavy application/diluted application and was applied on cold press watercolor paper (150 lb) material.
This color contains the following pigments:
PR48—Permanent Red
Pigment Type
organic, monoazo
Chemical Name
beta-oxynaphthoic acid lake
Chemical Formula
n/a
Properties
Beta-oxynaphthoic acid (BONA) lake pigments vary in their hue and other properties, depending on what metals they form a salt with. Both pure and mixed metal salts are used. They tend to have high tinting strength and good stability and lightfastness.
Permanence
Beta-oxynaphthoic acid lake pigments tend to have high tinting strength and good stability and lightfastness, but results vary with the application, and the presense of titanium dioxide may reduce lightfastness.
Toxicity
n/a
History
Beta-oxynaphthoic acid may have been synthesized as early as 1887. Commerical use of BONA lake pigments began in the 20th century.
Alternate Names
Brilliant Red, Ruby Red
PR112—Naphthol Red AS-D
Pigment Type
organic, monoazo
Chemical Name
n/a
Chemical Formula
C24H16Cl3N3O2
Properties
This Naphthol Red is an intense scarlet red pigment that is heavily staining. It has an average drying time. It is semi-transparent and has relatively poor covering power.
Permanence
This Naphthol Red has been rated as having excellent lightfastness under ASTM testing, but other testing methods have demonstrated some tendancy for the color to fade with exposure to strong ultraviolet light. It has been considered a replacement for less lightfast naphthol reds such as PR3. Not suitable for exterior use.
Toxicity
Naphthol Reds are not considered toxic. Naphthol Red AS-D may cause eye, skin, or respiratory irritation. Contact with dry pigment should be avoided.
History
Unknown.
Alternate Names
Naphthal, Naphthol Bordeaux, Naphthol Carbamide, Naphthol Carmine, Permanent Carmine, Permanent Red, Fanchon Red.
PY81—Diarylide Yellow 81
Pigment Type
organic, disazo
Chemical Name
diarylide yellow H10G
Chemical Formula
C36H32Cl4N6O4
Properties
Diarylide Yellow is a semi-opaque, moderately staining, intense deep reddish yellow pigment with good tinting strength and excellent heat resistance.
Permanence
Diarylide Yellow 81 is considered to have very good lightfastness, 7 on the blue wool scale (1-8).
Toxicity
Diarylide Yellow has no significant acute hazards, but its chronic hazards have not been well studied.
History
Diarylide Yellow comes from a family of azo pigments called diarylide. These yellow hued pigments were developed around 1940 and are very important in printing inks.
Alternate Names
Benzidine Yellow.
