Gamblin 1980 Oils -Cadmium Red Medium PR112-Naphthol Red
AS-D; PR108-Cadmium Red
Cadmium Red Medium: Darker than Cadmium Red Light, Cadmium
Red Medium is a valuable medium red with a strong, opaque masstone and muted
tint; light will not penetrate its surface.
Cadmium Red dries slowly. It grays down when mixed with
white, mixes well with blues to create a range of browns, and mixes well with
Cadmium Yellow to create an intense orange. It also works well in neutral
mixes.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PR112-Naphthol Red AS-D
- Pigment Type: organic, monoazo
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. Still, other testing methods have
demonstrated some tendency for the colour to fade with exposure to intense
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.
PIGMENT COMPOSITION AND PERMANENCE
- Pigment Name: PR108-Cadmium Red
- Pigment Type: inorganic, cadmium
PROPERTIES
Cadmium Red is a bright, warm red that ranges in the shade
from orange-red to maroon and is available in light, medium, and dark versions.
It is strong and opaque, with good tinting strength. Cadmium Red dries slowly.
It grays down when mixed with white, mixes well with blues to create a range of
browns, and mixes well with Cadmium Yellow to create an intense orange. It also
works well in neutral mixes. Cadmium pigments have been partially replaced by
azo pigments, which are similar in lightfastness to the cadmium colours,
cheaper, and non-toxic. Hues vary by brand. Cadmium Red is usually available in
either a pure grade or a cadmium-barium mix. The cadmium-barium mix has the
same permanence as pure Cadmium Red but has a lower tinting strength.
PERMANENCE
Cadmium Red is lightfast and permanent in most forms, but
like many cadmium pigments, it will fade in fresco or mural painting. Its
improved lightfastness has helped it to replace Vermilion on the artist’s
palette.
TOXICITY
Cadmium Red is a known human carcinogen. It is highly toxic
if inhaled and slightly toxic if ingested.
HISTORY
Cadmiums get their names from the Latin word cadmia, meaning
zinc ore calamine, and the Greek word kadmeia, meaning Cadmean earth, first
found near Thebes, the city founded by the Phoenician prince Cadmus. Metallic
cadmium was discovered in 1817 by Friedrich Strohmeyer, but Cadmium Red was not
introduced until 1907 in Germany.
