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Methyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid) , also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions.It is an azo dye, and is a 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, with a pKa of 5.1.ethyl red (2-(N,N-dimethyl-4-aminophenyl) azobenzenecarboxylic acid) , also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions.
Report Abuse. The purple x's probably indicate water damage. All the phones I've used in the past had a little circle that turned red when exposed to water. I would google it for your phone model and see what you can come up with.The reason they use indicators like that is because Water damage is not covered in your phones warranty.eport Abuse. The purple x's probably indicate water damage. All the phones I've used in the past had a little circle that turned red when exposed to water. I would google it for your phone model and see what you can come up with.