FIELD: analytical methods. SUBSTANCE: invention relates to assaying acetic acid in environmental control systems, in particular, in working zone air, industrial gas releases, and also in research practice. Indicator composition includes acid-base indicator neutral red (0.3-0.5), sodium hydroxide (0.1-0.2%) to provide required pH = 9.5, glycerol (35%) for most fully catching component in question from the mixture and uniform development of coloration on the surface of indicator composition, and water (2-4%), carrier and binder - cellulose (the balance). EFFECT: facilitated procedure. 1 tbl
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