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methyl red will disappear
You use methyl red as a ph indicator for for the MRVP test.
Methyl red is used as a pH indicator or for the identification of some bacteria.
The color of methyl orange is red. The color is red when the acetic acid is below pH 3.1.
Methyl Orange, Phenolphthalein, Litmus, Red Cabbage, Hydrangeas flower, Methyl red, Naptholpthalein, Bromophenol Blue