This ninhydrin solution reacts with amino acids present in sweat and turns purple due to the formation of Ruhemman's purple.

这种茚三酮溶与汗氨基酸发生反应，由鲁赫曼紫形成而变成紫色。

For porous surfaces like paper or walls, fingerprints are detected by spraying a solution called ninhydrin on the surface where a print may be found.

对或墙这样多孔表面，通过在可能发现指纹表面喷洒一种叫做茚三酮溶来检测指纹。