Glossary of Printing Terms:
Penetrating Ink

Penetrating inks contain a penetrating red dye that goes into the fibers of the paper and will show through to the back of the document.

Penetrating inks are commonly used on the arabic and MICR numbering of negotiable documents to deter forgers from trying to scrape the number off from the document.

If the number is scraped off the red stain remains on the document.


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