| 词条 | Weidel's reaction |
| 释义 | {{Unreferenced|date=April 2010}} Weidel's reaction may refer to either a chemical reaction showing the presence of uric acid or xanthine bodies, or to a test (now considered obsolete) based on that reaction (invented by the 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. 2 : Chemical tests|Name reactions |
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