Diethanolamine appears as oily colorless liquid or solid white crystals. Slight rotten fish or ammonia odor. Denser than water. (USCG, 1999)Diethanolamine is a member of the class of ethanolamines that is ethanolamine having a N-hydroxyethyl substituent. It has a role as a human xenobiotic metabolite. It derives from an ethanolamine.