- an orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator.
Compare methyl red.
Origin of methyl orange
First recorded in 1880–85
Also called gold orange, helianthine B, orange III, tropaeolin D, tropeolin D.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for gold orange
Historical Examples of gold orange
Tint with methyl-orange and titrate with semi-normal ammonia.A Textbook of Assaying: For the Use of Those Connected with Mines.
Cornelius Beringer and John Jacob Beringer