Methyl Red is good.
Product desciptions:
Methyl Red is Shiny purple or red-brown crystalline powder, it is soluble in ethanol and acetic acid, almost insoluble in water; ethanol solution by the time saved can be played by carboxyl esterification leaving a significant reduction in sensitivity; maximum absorption wavelength of 410nm.
Usages:
It can be used for staining Protozoa in vivo ; acid-base indicator, pH color range 4.4 (red) to 6.2 (yellow); titration of ammonia, a weak organic bases and alkaloids, but does not apply in addition to organic acids other than oxalic acid and picric acid; with bromine cresol green and methylene blue mixed indicator composition to reduce discoloration and improve the color of the field sensitivity; precipitation titration of the adsorbed indicator, such as the fluoride ion with thorium nitrate titration; test free chlorine, chlorite and other oxidants;
Methyl red is the one commonly used in acid-base indicator, often a concentration of 0.1% ethanol solution, pH4.4 (red) -6.2 (yellow). Also used for protozoa in vivo staining.
CAS No. : 493 -52-7
Molecular formula: C15H15N3O2
Molecular Weight: 269.30
more about：Methyl Red +manufacturers
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