1,4-Dihydroxyanthraquinone, also called quinizarin or Solvent Orange 86, is an organic compound derived from anthroquinone. Quinizarin is an orange or red-brown crystalline powder. It is formally derived from anthraquinone by replacement of two hydrogen atoms by hydroxyl (OH) groups. It is one of ten dihydroxyanthraquinone isomers and occurs in small amounts (as a glycoside) in the root of the madder plant, Rubia tinctorum.
Appearance & Physical State
orange or red crystalline powder
<1 g/L (20 ºC)
Stable under normal temperatures and pressures.
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances.