helianthine


meth·yl or·ange

(meth'il ōr'enj), A weakly acid dye used as a pH indicator (red at 3.2, yellow at 4.4). Synonym(s): helianthine

helianthine

(hē-lē-an′thĭn) [ Helianthus, botanical genus + -ine] Methyl orange used as an indicator in determining pH.