万用表测量字迹电阻方法的初步研究

Studies on testing the resistance of the handwritings by versatile gauge

目的介绍一种鉴定添加变造黑色笔迹的新方法—万用表测量字迹电阻法。方法用万用表的探针测量字迹笔画的电阻值数值,根据数值的大小范围来判断字迹是否存在添加变造。结果该方法简便快速,不破坏原件,不受检测条件及环境的限制,成本低,效率高,便于广泛推广应用。结论凡是可测出电阻值数值的,证明书写色料中的成份是以碳黑为主,凡电阻值为正无穷大时,证明书写色料中不含碳黑,而是由多种色料拼色而成的,从而可分析判断字迹是否被添加变造。

Objective To introduce a new way of identifying the black handwritings which have been added or changed. Method Testing the resistance of the handwritings stroke by versatile gauge. Result According to the measurement of the handwritings＇resistance, we can decide if it has been added or changed. Conclusion This way has the strongpoint such as simple, fast, the original document wouldn＇t be destroyed, it wouldn＇t be limited by the test condition, low cost and high efficiency, so it is very convenient to promote and apply.