Abstract
In the preceding paper the author has proposed an assumption that the colored substance in oxidized acids* which he considers as an essential coloring factor of discolored oil, may have been derived from acidic carbonyl compounds produced during autoxidation. In this paper the mode of discoloration as well as the solubility shown by 19 kinds of pure carbonyl compound on being treated by the familiar reagents used in the separation of oxidized acid, i.e., alcoholic potash followed by mineral acid, was investigated comparing with the properties of oxidized acid. The authors' assumption seems to be favored by the result now obtained: On treatment, all the carbonyl compounds here studied gave coloring substance very similar to that found in so called oxidized acid in so far as they belong to half aldehyde longer than glutaric half aldehyde.
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