Weidel's reaction

Weidel's reaction

A chemical reaction showing the presence of uric acid or xanthine bodies, or a test (now considered obsolete) based on that reaction. Invented by an Austrian chemist Hugo Weidel.

A solution of the suspected substance in chlorine water with a little nitric acid is evaporated in a water bath, and then exposed to the vapor of ammonia; the presence of xanthine is indicated when a red or purple color develops.


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