Chromic acid converts it into phosgene (carbonyl chloride, COCl2).
On oxidation, the molecule is split at the carbonyl group and a mixture of acids is obtained.
This is probably due to the formation of carbonyl gas in the smothered fire.
The salts of the carbonyl acids and other acid phenol dyes are but little suitable: and least of all, the nitro dyes.
carbonyl car·bon·yl (kär'bə-nĭl')
The bivalent radical CO.