Euthiochroic /(?)/

Eu·thi·o·chro·ic

Euthiochroic

a.
  1. Pertaining to, or denoting, an acid so called. (Chem.)

Phrases & Compounds
Euthiochroic acid
a complex derivative of hydroquinone and sulphonic (thionic) acid. -- so called because it contains sulphur, and forms brilliantly colored (yellow) salts.