Molecular formula :
nature : Emodin also known as 7 - ether. Orange yellow needle-like crystals (from recrystallization acetate). The temperature of 206 ° C to 207. Insoluble ethanol, acetone, soluble in benzene. Case of sodium hydroxide was red purple. The concentrated sulfuric acid red. As a lichen anthraquinone pigments. Exist in lichens rupprechtii parietina Z. Fr. Aspergillus and glaucum (Aspergillus glaucus group), and Ferrand rhamnose (Rhamnus frangula L.) bark, leaf-rhubarb (Rheum undulatum L.), Claws rhubarb (R. tanguticum Maxim) the rhizomes. Derived from the extraction. For natural dyes.
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