目的 探讨激光打印机的暗记特征，为鉴别彩色激光打印、复印文件找到一种有效的方法。方法 根据不同物质对光的反射特性及蓝色与黄色互补特性的原理，采用420nm左右蓝光照射方法，对部分品牌彩色激光打印、复印文件进行了初步分析研究，总结了暗记点阵形态特征、小点形态特征、出现位置特征和排列含义等特征。结果 此方法对彩色激光打印、复印机具的种类鉴别和个体鉴别简便、有效。

Objective To explore the use of identification code of color laser printer in document examination. Method 9 samples printed by color laser printer or color copier, 420nm light was used for developing the code on paper. Results The identification code vary with type and manufacture of printer or copier. For some type printer, the code varies with time. Conclusion Identification code of printer and copier can be used for examining printed document.