Gunari

Description

A bright yellow, natural dyestuff obtained from the leaves of the Indian mahogany tree, Cedula toona, native to the southern Asia. Gunari has been used to dye wool and silk a bright yellow color. The primary colorant in gunari is crocetin. Crocetin is a substantive dye that is also found in saffron.

Synonyms and Related Terms

Natural Yellow 4

Other Properties

Crocetin is soluble in water, ethanol, alkali solutions. Crocetin forms a blue solution in concentrated sulfuric acid.

Additional Information

J.Hofenk-de Graaf, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, September 1969.

Authority

• Helmut Schweppe, Schweppe color collection index and information book

• Colour Index International online at www.colour-index.org

• Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969