Grumbacher Academy Watercolor - Geranium Lake, 7.5 ml tube
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Products bearing the AP seal of the Art & Creative Materials Institute, Inc. (ACMI) are certified non-toxic. A product can be certified non-toxic only if it contains no materials in sufficient quantities to be toxic or injurious to humans, or to cause acute or chronic health problems.
Product Details
- Color:
- Geranium Lake
- Size:
- 7.5 ml
- No.
- 078
- Mfg #:
- A078
Colors on Monitors -
Due to differences in users’ monitors, the colors presented are an approximation of the true color.
Reviews
Pigment Information
This color contains the following pigments:
PR170-Naphthol Red
PR149-Perylene Red
PR166-Cromophtal Scarlet
Pigment Name
PR170-Naphthol Red
Pigment Type
organic, naphthol AS
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
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. 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
PR149-Perylene Red
Pigment Type
organic, anthraquinone
Chemical Formula
C40H26N2O6
Properties
Perylene Red is a moderately intense, semi-opaque, medium red pigment, appearing somewhere between a Cadmium Red and a Cadmium Deep Red hue. It has excellent brightness and tinting strength. Its partial transparency makes it useful as a glazing color.
Permanence
Perylene Red has good lightfastness and permanence. Its tints may darken after extended exposure to sunlight. It is not considered suitable for exterior use.
Toxicity
Perylene Red has no significant acute toxicity. Its long term hazards are currently unknown.
History
Perylenes have been used as vat dyes since 1912, but they were not manufactured and sold as pigments until 1957. For artists, they are a replacement for historic colors that were made with berries, and are significantly more lightfast.
Pigment Name
PR166-Cromophtal Scarlet
Pigment Type
organic, disazo
Properties
Pigment Red 166 has a yellowish red tone. It is semi-transparent and has high tinting strength.
Permanence
Pigment Red 166 has very good lightfastness.
History
Pigment Red 166 is a disazo condensation pigment, and is used in paints, plastics, printing inks, packaging, textiles, and many other applications.
Safety Data Sheet
UPC Code: 014173350695
ASIN #: B000G2J5EO