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4- (2-pyridylazo) resorcinol sodium monohydrate (or PAR) is an indicator.
P 1307 (OTTO) PAR, indicator, 99% Cas 16593-81-0 - used as a complexometric indicator. P 1307 (OTTO) PAR, indicator, 99% Cas 16593-81-0 - used as an acid-base indicator.