nGarancin(Chem) An extract of madder by sulphuric acid. It consists essentially of alizarin.
Century Dictionary and Cyclopedia
ngarancinThe product obtained by treating pulverized madder, previously exhausted with water, with concentrated sulphuric acid at 100° C. (212° F.), and again washing with water. The residue thus obtained is found to yield better results in dyeing than madder itself, the colors produced by it being more brilliant and requiring less after-treatment, while the parts of the fabric desired to be kept white attract hardly any color.