Yvon test

Y·von test

(ē'von[h]),
1. for alkaloids; to the suspected solution is added a mixture of bismuth subnitrate, potassium iodide, and hydrochloric acid in water; a positive reaction is indicated by the appearance of a red color;
2. for acetanilid in the urine; the suspected fluid is extracted with chloroform and heated with yellow nitrate of mercury; if acetanilid is present, the fluid will be green.

Yvon,

Paul, French physician and chemist, 1848-1913.
Yvon test - for alkaloids.