Daler Rowney Aquafine Gouache - Burnt Umber, 15 ml, Tube

Item #:00900-8052
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Daler Rowney Aquafine Gouache - Burnt Umber, 15 ml, Tube with Swatch
Daler Rowney Aquafine Gouache - Burnt Umber, 15 ml, Tube with Swatch
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Product Details

Color:
Burnt Umber
Description:
Aquafine Gouache
Size:
15 ml (.5 oz)
Format:
Tube
No.
223

Pigment Information

This color contains the following pigments:

PY155-Bisacetoacetarylide Yellow 155

PR176-Benzimidazolone Carmine

PBk7-Lamp Black


Pigment Name

PY155-Bisacetoacetarylide Yellow 155

Pigment Type

organic, bisacetoacetarylide

Chemical Formula

Properties

Pigment Yellow PY155 is a  greenish yellow with high tinting strength and good solvent resistance. It is often used as a replacement for chromium yellow.

Permanence

Pigment Yellow PY155 has very good lightfastness, but some monoazo yellows have better weatherfastness. It may not be suitable for exterior applications. Grades with coarser particles have been reported to have much better weatherfastness.

Toxicity

History

Bisacetoacetarylide pigments are a subgroup of the disazo pigments. Although many have been described and patented, only a few are commercially available. Pigment Yellow PY155 is used in paints, plastics, printing inks, and industrial coatings.


Pigment Name

PR176-Benzimidazolone Carmine

Pigment Type

organic, azo

Chemical Formula

C32H24N6O5

Properties

Benzimidazolone Carmine is a staining, dull red transparent pigment with high tinting strength. Its color is similar to, although somewhat darker than, Rose Madder, the natural source of the historic color Alizarin Crimson. Because it stains and tints much more strongly than natural Rose Madder, care is required to achieve the same effects.

Permanence

Although it is not absolutely lightfast, Benzimidazolone Carmine has excellent lightfastness for a transparent red organic pigment, and as a result, it is often chosen as a more permanent pigment to replace Alizarin Crimson.

Toxicity

Benzimidazolone Carmine is not considered toxic.

History

The benzimidazolone group of pigments was developed and patented in 1960 by Hoechst A.G., a German chemical manufacturer that was a forerunner of the pharmaceutical company Aventis. They differ very widely in hue.


Pigment Name

PBk7-Lamp Black

Pigment Type

inorganic

Chemical Name

carbon

Chemical Formula

C

Properties

Lamp black is a very opaque, heavily staining black pigment that does not have much covering or tinting power. It is typically the most opaque black in watercolor form. Though a very pure black, it tends to muddy slightly in mixtures. Natural sources may be brownish or bluish in tone because of impurities. When used in oil paints, it is one of the slowest drying pigments, and should not be used in underpainting or applied in layers underneath other colors.

Permanence

Lamp Black is very lightfast and absolutely permanent. It is used in all techniques in permanent painting.

Toxicity

Carbon itself is not considered hazardous, however other combustion products that are hazardous are often present as impurities when Lamp Black is produced from natural materials. For this reason, commercial preparations of the pigment should be considere

History

Lamp Black is a carbon based black traditionally produced by collecting soot (known as lampblack) from oil lamps. It has been used as a pigment since prehistoric times. It is the black found in Egyptian murals and tomb decorations and was the most popular black for fresco painting until the development of Mars Black.


Safety Data Sheet

UPC Code: 5011386117270