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1995年6月初,浙江绍兴市某公司保卫科发现一起该公司保卫科工作人员利用职务之便侵吞罚没款的案件,并获取蓝色复写纸一张。我们对该蓝色复写纸进行观察,发现复写纸上有字迹笔划但反差不明显。将复写纸对着光亮处观察,可见复写纸上字迹清晰。于是,我们将复写纸按常规置于翻拍机上,采用透射光照相的方法拍照,效果很不理想。经反复思考,我们决定利用复写纸上其笔划的粗糙特性与纸张本身的平整性,即利用其对所照射光线的不同反射特性来拉开其反差。用荧光灯在两侧约40度角处,采用对称均匀照明的方法进行拍摄,终于比较好地将这张蓝色复写纸上的字迹拍摄下来,为认定犯罪提供了直接证据。
In early June 1995, a security company in Shaoxing City, Zhejiang Province, discovered that a case in which the company security department staff used his position to swallow a foul and took a piece of blue carbon paper. We observed the blue copy paper and found that the strokes on the copy paper but the contrast is not obvious. The carbon copy paper in the light of the observation, we can see the carbon copy paper clear. So, we will copy paper placed on the conventional remake machine, the use of transmitted light photography method, the effect is not very satisfactory. After repeated thinking, we decided to take advantage of the roughness of the strokes on the carbon paper and the flatness of the paper itself, that is, using its different reflection characteristics on the irradiated light to unleash its contrast. Fluorescent light at about 40 degrees on both sides of the corner, the use of symmetrical uniform lighting method of shooting, and finally better to copy the handwriting on this blue carbon paper, to provide direct evidence of crime.