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市场上销售的用于改正文件中错误的涂改液,因书写材料和用途的不同,品种各异。近来,要求显现、辨读因涂改液掩盖而无法辨读的文字的案件越来越多。这种情况一般使用透射光显现法进行检验。这种方法遇到涂抹不均匀尤其是涂改液层较厚的情况,大多无法显现出被掩盖文字。而且,由于显现出的被掩盖的文字笔画与在晾干了的涂改液层上书写的文字笔画重叠的时候,辨读被掩盖文字也较为困难。因此,研究人员试着利用红外线电视摄像机和滤色镜显现被涂改液掩盖的文字。
Misdirected correction fluids marketed for correction of documents vary in type due to different writing materials and uses. Recently, more and more cases have been asked to show and read the text that can not be read due to the covering of correction fluid. This situation is generally tested using the transmitted light method. This method encountered uneven coating, especially the correction of the thick layer of liquid, most can not be seen to be covered text. Moreover, it is also more difficult to discern the covered text as the masked text strokes appear to overlap with the written strokes that are written on the dried overcoat. Therefore, the researchers tried to use infrared television cameras and color filters to show the text covered by correction fluid.