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A colorant found in old fustic, Cuba wood, yellow brazilwood, jakwood, and Osage orange tree. Morin crystallizes from ethanol to form colorless needles. It turns an intense yellow in alkaline solutions, but will slowly turn brown with exposure to air. Morin is used as a dye for wools: with Chromium it gives an olive green, with Aluminum and Tin, it is yellow, and with Iron, morin is a deep olive brown. It is also used as a spot test reagent for salts of Aluminum, Beryllium, Zinc, Gallium, Indium, and Selenium.

Chemical structure


Synonyms and Related Terms

2',3,4,5,7-pentahydroxyflavone; Natural Yellow 8; Natural Yellow 11; CI 75660; morina (Esp., Port.); morin hydrate; moric acid


  • Combustible.
  • Contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in ethanol, alkalis, acetic acid. Slightly soluble in water.

Soluble in sulfuric acid forming a solution with green fluorescence.

Composition C15H10O7-2H2O
CAS 480-16-0
Melting Point 285 C
Molecular Weight mol. wt. = 302.23

Resources and Citations

  • F. Crace-Calvert, Dyeing and Calico Printing, Palmer & Howe, London, 1876
  • Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 6352