| 摘要 |
The invention concerns a process for treating instruments of credit or any valuable document with invisible thermosensitive inks. The so processed documents are, for the purpose of antitampering test, then controlled by a checking device, which induces a transition of the inks from invisible to coloured, said transition being irreversible. The checking device (checker) consists of a temperature controlled device embodied with heating rolls 6-6' or infrared lamp. The antitampering process is also applicable to the domain of variable data of pharmaceutical containers.
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