Utrecht Studio Series Acrylic Paint - Medium Orange, Quart

This color contains the following pigments:

Diarylide Yellow 83

Dianisidine Orange

Pigment Name

Diarylide Yellow 83

Pigment Type

organic, disazo

Chemical Formula

C36H32Cl4N6O8

Properties

Diarylide Yellow is a semi-opaque, moderately staining, intense deep reddish yellow pigment with good tinting strength.

Permanence

Diarylide Yellow 83 has very good lightfastness and permanence. However, it can fade in tints, so some artists do not consider it suitable as an artists’ color. Many other diarylide yellow pigments are reported to have fair to poor lightfastness, and some are completely fugitive. Diarylide Yellow 83 is reputed to be one of the most permanent of the entire group.

Toxicity

Diarylide Yellow has no significant acute hazards, but 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.

Pigment Name

Dianisidine Orange

Pigment Type

organic, disazo

Chemical Formula

C34H32N6O6

Properties

Dianisidine Orange is a semi-opaque orange dye that can be laked to form a pigment. This pigment  ranges from yellowish to reddish orange in different laked forms.

Permanence

Dianisidine Orange has only fair lightfastness.

Toxicity

A Japanese study in which rats were given large daily doses of Dianisidine Orange revealed no acute toxicity or mutagenic effects.

History

Dianisidine Orange is used mostly in coloring plastics and in inks, in applications where safety is important but lightfastness and longevity are not paramount.