n :  a fixing and preserving solution consisting of picric acid, formaldehyde, and glacial acetic acid - called also Bouin , Bouin's solution 
 
Bou•in, Pol André (1870-1962), French histologist. In collaboration with Paul Ancel for thirty years, Bouin undertook research on the physiology of reproduction that laid the groundwork for the development of reproductive endocrinology. Among other things, the pair successfully demonstrated that the testis has a dual function and that the Leydig cells of the testis control the secondary sex characteristics in the male. Bouin's fluid was introduced in 1897.
 
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