Abstract
Dulcin has been detected by reaction with fuming nitric acid followed by interaction with phenol and sulphuric acid. Other tests use electron capturing reagents such as mercuric nitrate or silver nitrate. The test under study is not based in degradations initiated by nitration, nor by oxidations by electron removal, but by molecular fission after prototropy enhanced by heating. p-Phenetidine is obtained and forms the ammonium salt with sulphuric acid. After cooling and water addition, the solution is carefully covered with ammonium or sodium hydroxide. The interphase is coloured blue or violet-blue due to formation of the halochromic salt p-ethoxyphenylammonium phenoxide, from phenol and after ion switching.
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