Methyl Red

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Methyl Red is an indicator dye that turns red in acidic solutions. It would normally appear as an dark red crystalline powder. Methyl Red is a pH indicator; it is red in pH under 4.4, yellow in pH over 6.2, and orange in between. Methyl Red can also be used to test if E. Coli is present in a substance.

References[edit]

https://web.archive.org/web/20090922042431/http://ibchem.com/IB/ibnotes/full/aab_htm/18.6.htm