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The mechanism of triethanolamine (TEA) soap browning has been uncovered. The reaction proceeds as follows. Firstly, TEA is degraded into diethanolamine and acetaldehyde. Secondly, diethanolamine is further degraded into monoethanolamine and acetaldehyde. Thirdly, two molecules of acetaldehyde dimerize to crotonaldehyde, which reacts with monoethanolamine to generate brownish products with conjugated...