Watermark inks can be printed in offset, letterpress and flexography; they are used for printing a watermark which will give a certain transparency on a paper, not exceeding 90gsm. As those inks are rather oily, it is advisable to print them on the back side of the paper and to avoid overprinting them.
The effect of transparency will be reach after a period of 24-48 hours, because ink needs that time for a complete migration through the paper. Consequently a coated paper cannot be used.
Letterpress is the best printing process because the watermark ink is push inside of the paper. In addition to our standard version, our range includes fluorescent watermark inks, fluorescent in blue, green and yellow under UV lights. A watermark ink is also available for wet offset, but less efficient.