A bright yellow natural dyestuff obtained from the red berry-like fruit of the Gardenia grandiflora that is native to China. Wongsky has been used to dye silk a bright yellow color. The primary colorants in wongsky are Crocetin and Crocin. Crocetin is a substantive dye that is also found in Saffron.
Synonyms and Related Terms
wongshy; Chinese yellow pods; Chinese yellow berries; Natural Yellow 6; hoang-tchy; crocin; crocetin; Gardenia grandiflora
Physical and Chemical Properties
- Crocetin is soluble in water, ethanol, alkali solutions.
- Crocetin forms a blue solution in concentrated sulfuric acid.
Resources and Citations
- Helmut Schweppe, Schweppe color collection index and information book
- Encyclopedia Britannica, http://www.britannica.com Comment: "Gardenia." (Accessed 7 Apr. 2005).
- F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
- 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