dioxazine

Dioxazine refers to a family of synthetic organic compounds that contain a heterocyclic ring system known as the dioxazine core. The core is a six‑membered ring with oxygen and nitrogen atoms, usually fused to aromatic rings, and it can be substituted to yield a range of derivatives. The term is most commonly encountered in the context of dioxazine pigments used to produce vivid violet and purple colors.

Dioxazine pigments are manufactured on an industrial scale for use in paints, inks, plastics, and coatings. The prototypical member is a bright dioxazine violet pigment, and many related pigments extend the color range into purples and blue‑violets. Their distinctive color comes from the extended conjugation in the dioxazine ring system, and substitutions on the ring modify hue, tinting strength, and lightfastness.

In terms of properties, dioxazine pigments are valued for high color strength and generally good lightfastness, making them popular in artistic and commercial applications. They are typically insoluble solid pigments, dispersing in binders to impart color rather than dissolving. Their performance can vary with medium, binder, and processing conditions, and some formulations may exhibit limited heat stability.

Safety and handling considerations for dioxazine pigments follow standard practices for inorganic and organic pigments. They are largely inert when embedded in a matrix, but inhalation of pigment dust should be avoided, and routine industrial hygiene and waste disposal guidelines should be followed.

See also: Pigment, Organic pigment, Dioxazine pigments.