Alizarin or
1,2-dihydroxyanthraquinone (also known as
Mordant Red 11 and
Turkey Red) is an
organic compound with formula that has been used throughout history as a prominent red
dye, principally for dyeing textile fabrics. Historically it was derived from the roots of plants of the
madder genus. In 1869, it became the first natural pigment to be duplicated synthetically.