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From Nessler + -ize, after the name of a German chemist, Julius Neßler.
Etymology from Wiktionary, CC BY-SA 4.0.
nesslerize
Today it means: To treat or test (a liquid) with a solution of mercuric iodide in potassium iodide and potassium hydroxide (Nessler's reagent) in order to detect the presence of ammonia. Full definition →