Ibn Rassam is widely known to have invented the techniques through which he obtained copper from varieties of malachite, he also ascertained indigo by heating various substances. He was also a colleague of the chemist, Abul Ashba ibn Tammam (d.1361).
- M. Th. Houtsma, Martijn Theodoor Houtsma. E.J. Brill's first encyclopaedia of Islam, 1913-1936, Volume 4. Books.google.com.pk. Retrieved 2010-06-14.
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