Luteolin

Description

The principal yellow colorant in the dye weld. Luteolin is a flavone type dye. It is extracted in a hot alkaline solution made with boiling water and potash. Depending on the mordant, weld produces colors ranging from bright yellow (tin) to gold (aluminum) to green (iron). Among natural dyes, it is one of the most lightfast,

Synonyms and Related Terms

weld; 5,7,3',4' tetrahydroxyflavone (IUPAC); luteolina (Esp., Port.)

Physical and Chemical Properties

• Needle-like crystals.
• Soluble in ethanol and alkaline solutions. Slightly soluble in water.
• Composition = C15H10O6
• CAS = 490-70-3
• Molecular Weight = mol. wt. = 286.24

Resources and Citations

• Contributed information: Cindy Connelly Ryan, August 2007, IUPAC name
• Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
• The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5641
• The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: 'Pigments'