Orthotolidine is a calorimetric indicator of chlorine residual. If chlorine is present, a yellow-colored compound is produced. This reagent is no longer approved for chemical analysis.
ORTHOTOLIDINE (OR-THO-TOL-UH-DINE)
Meaning of ORTHOTOLIDINE (OR-THO-TOL-UH-DINE) in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012