灰尘手印是刑事案件现场常见的痕迹之一,对于这类痕迹,通常多采用拍照方法提取,然而拍照方法也仅限于那些反差较大有立体感的灰尘手印。对于一些肉眼难以看见的反差极小又几乎接近平面的灰尘手印,用照相法提取就很难达到理想的效果,致使许多刑事案件现场的灰尘手印不能得到有效的利用,给侦察案件造成困难。近几年研究出用硫氰酸气体熏显法来加大灰尘手印的反差,在实践中收到一定效果, Dust fingerprints are one of the common marks on the scene of criminal cases. For such marks, they are often extracted by taking pictures. However, the photographing method is also limited to those rubbing fingerprints with large contrast. It is very hard to achieve the desired result with some dusty fingerprints that the naked eye can hardly see with extremely small contrast and almost flatness. Therefore, the dusty fingerprints on the scene of many criminal cases can not be effectively utilized, which makes it difficult to reconnaissance cases. In recent years, research and development with thiocyanate gas smoke method to increase the contrast of dust fingerprints, in practice received some results,