Nessler reagent

Ness·ler re·a·gent

(nes'lĕr),
a solution of potassium hydroxide, mercuric iodide, and potassium iodide; it yields a yellow color with ammonia (a brown precipitate with larger amounts) that can be used for quantitative assay.

Nessler,

A., German chemist, 1827-1905.
Nessler reagent - a solution of potassium hydroxide, mercuric iodide, and potassium iodide.
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3]-N), a ammonia nitrogen determination by sample reaction in alkaline conditions with Nessler reagent, potassium tetraiodomercurate ([K.