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墨汁之间互相掩盖及不同墨水字(如碳素墨水,绘图墨水,墨汁等)的识别是世界文检难题之一。因为不同墨汁之间已很接近,它们具有极稳定的化学性质,永不褪色,难以用普通化学方法消褪,而且目前越来越多的被人们采用。尤其近年来有的签字笔水本身就含炭黑,一般方法,如已有的物理方法,光学器材拍照方法均不能解决。
The masking of ink and the recognition of different ink words (such as carbon ink, drawing ink, ink, etc.) are one of the problems in world literacy inspection. Because of the close proximity between different inks, they have extremely stable chemical properties, never fade, are hard to fade by conventional chemistry, and are used by more and more people. In particular, in recent years, some signature pen water itself contains carbon black. The general methods, such as the existing physical methods and the optical equipment photographing methods, can not be solved.