1利用不同光源拍照血掌纹痕迹1992年8月23日,齐齐哈尔市昂昂溪区友好街欢欢食杂店发生一起入室抢劫杀死两人的特大案件。现场勘查发现食杂店门内侧深绿色漆面的墙垛上留有一枚两次形成的血掌纹。其中一部分重叠,另一部分纹线未重叠。在未重叠的残缺掌纹边缘部分,侧光下隐约发现 1 Using different light sources to photograph the bloodline marks On August 23, 1992, a big case of robbery and killing of two people took place together at the Huanghu Street Huanghu Street Grocery Store in Ang Aang District of Qiqihar. Site investigation found that the grocery shop inside the dark green paint on the wall left a two blood palmprint pattern. One part of the overlap, the other part of the lines do not overlap. In the non-overlapping edge of the edge of the incomplete palms, dimly found in the side light