不锈钢刀面上重叠指印分离技法的探讨

实验目的：不锈钢刀面上两种不同物质的重叠指印分离，包括（1）分离不锈钢刀面上先汗液后灰尘指印和先灰尘后汗液指印，（2）分离不锈钢刀面上先血后灰尘指印，（3）先灰后血指印和分离不锈钢刀面上先油后灰尘指印和先灰后油指印。实验（1）中汗液与灰尘指印，无论是灰尘在上还是在下，分离出来的汗液和灰尘指印效果都比较好，都有较高的检验价值。实验结果：实验（2）中灰尘与血指印，无论血和灰尘谁在上或在下，分离出来的血指印和灰尘指印效果都比较理想，具有较高的检验价值。实验（3）中灰尘与油指印，无论油指印在上或是在下，效果都比较理想，但灰尘指印的按捺顺序对灰尘指印有一定影响。

Probing into the Separation Techniques of Overlapped Fingerprints on the Stainless Steel Knife Surface

Objective： the separation of two different substances overlapped fingerprints from stainless steel knife surface, including （1） the separation from sweat-on-dust fingerprints with dust-on- sweat ones; （ 2） the separation of blood - on-dust fingerprints with dust-on- blood ones ; （3） the separation from oil-on- dust fingerprints with dust-on-oil ones. In the first experiment, the sweat-on-dust fingerprints, either up or down, can be well separated out with a higher test value. In the results of second experiment, the dust-on- blood fingerprints, either up or down, can be separated out ideally with extreme test value. In the third experiment, the dust-on-oil fingerprints, either up or down, the effects are more ideal, but the sequence has certain influence on the dust fingerprints.