Taigu wood dye

Description

A scarlet dye extracted from the wood of the taigu or Surinam greenheart tree native to South America and Asia. Taiguic acid, the primary coloring agent, is extracted with alcohol and dries to form yellow prismatic crystals. The colorant turns brown in sunlight. Taigu dye gives a bright orange-red color to cotton from alkaline solutions.

Synonyms and Related Terms

taiguic acid; lapachol (CI 75490); lapachic acid; tayegu wood dye; Surinam greenheart dye; Lapacho heartwood dye; Bethbarra wood dye; Natural Yellow 16;

Physical and Chemical Properties

• Solution in alcohol, chloroform, benzene, acetic acid. Slightly soluble in hot water, ether.
• UV max 251.5, 278, 331 nm.

CAS	84-79-7
Melting Point	140 C

Resources and Citations

• Helmut Schweppe, Schweppe color collection index and information book

• The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5195

• F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876 Comment: p. 300

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