1911 Encyclopedia Britannica
Also known as A'L, ACH, or AICH, the Hindustani names for the Morinda tinctoria and Morinda citrifolia, plants extensively cultivated in India on account of the reddish dye-stuff which their roots contain. The name is also applied to the dye, but the common trade name is Suranji. Its properties are due to the presence of a glucoside known as Morindin, which is compounded from glucose and probably a trioxy-methyl-anthraquinone.
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Chisholm, Hugh, General Editor. Entry for 'Aal'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/aal.html. 1910.