helianthine


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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.
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