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From The Collaborative International Dictionary of English v.0.48:
Nesslerize \Ness"ler*ize\, v. t. [From Nessler, the chemist.] (Chem.) To treat or test, as a liquid, with a solution of mercuric iodide in potassium iodide and potassium hydroxide, which is called Nessler's solution or Nessler's test, and is used to detect the presence of ammonia. [1913 Webster]