(?), a. [Gr. e'y^ well + sulphur + color.] (Chem.) Pertaining to, or denoting, an acid so called.
[1913 Webster]

Euthiochroic acid (Chem.), a complex derivative of hydroquinone and sulphonic (thionic) acid. -- so called because it contains sulphur, and forms brilliantly colored (yellow) salts.
[1913 Webster]


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Mon 17th December 2018