Blue, Diphenylamine Methylene

Some other inhibitors from the patent literature include hydroquinone [129], ionoP [130], and quinone [131]. Other inhibitors used to stabilize MMA include butylated hydroxy toluene (BHT), phenothiazine, methylene blue, hydroxy-diphenylamine and di-/jc/<3-napthol [132]. Several good reviews of inhibition and inhibitors have been written [133-136]. The mechanisms of inhibition are subtle and complicated. For example, it has been reported that highly purified benzo-quinone acts as a retarder rather than an inhibitor [137]. It has been proposed... 

Redox indicators include indophenols for example, 2,6-dichlorophenolindophenol azine dyes such as the well-known thiazine dye methylene blue indigo carmine and other indigo derivatives derivatives of diphenylamine including diphenylamine-4-sulfonic acid and variamine blue and the 1,10-phenanthro-line-ferrous complex. 

Mts materials prepared by derivatisation of carbon powder with the individual substances being as follows anthracene, azobenzene, diphenylamine, 9,10-diphenylanthracene, 1,3 diphenyl quanidine, fluorescein, methylene blue, 3-nitrofluoroanthene, 6-nitrochrysene, 9-nitroanthracene, 9,10-phenanthraquinone, thionin, triphenylamine, and 2,5-dimethoxy-4-[(4-nitrophenyl)azo]-benzenediazonium chloride... 

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