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Different types of ink
 It is on the basis of this balance, which determines the drying mode, that 3 types of inks can be distinguished: overnight inks, semi-overnight inks and siccative inks.
Overnight inks
These inks are only slightly siccative: there is practically no air oxidation. Thanks to improvements in raw materials (resins, etc.), their setting and drying, formerly quite moderate, have been considerably enhanced.
With this type of ink, the ink tin can be left open for several days, and the ink left in the duct for more than 24 hours, without the formation of a dried skin on the surface.
 Precautions
Since overnight inks dry mainly through penetration, they may cause set-off problems on some substrates, such as non-absorbent coated or matt coated papers.

Semi-overnight inks
Semi-overnight inks are moderately siccative. They therefore dry more quickly, allowing the prints to be handled several hours after printing. The printing conditions, the type and the quality of the substrate are criteria that have a considerable influence on the drying and therefore how soon prints can be cut and folded.
Precautions
Air oxidation of the ink leads to the formation of a dry skin on the surface of the ink in tins that have been left open or in ink ducts after around twelve hours. To slow down this phenomenon, we recommend covering the surface of the tins with cello- phane and spraying an antioxidant (Anti Drying A11) onto the ink ducts and rollers for stoppages longer than this time.

Siccative inks
These inks contain high contents of drying agent. Their rate of surface and in-depth drying is very rapid, around 2 to 3 hours. For this reason they are recommended for printing matt coated paper, non absorbent substrates and synthetics. 
Precautions
Drying begins as soon as the ink comes into contact with the air. Care should be taken to assure the absence of any surface skin in the tin so as to avoid introducing particles of dry ink into the ink duct (risk of hickies). If the press is stopped for longer than 30 minutes, an antioxidant (Anti Drying A11) should be sprayed over the ink duct and rollers.
Despite this classification, recent advances in chemistry have made it possible to develop inks that are more and more versatile in terms of their behaviour and performance characteristics.
For this reason, we have developed an “Ink Profile” for each of our Process Colour ranges, enabling the most suitable ink to be recommended as a function of the substrate and quality of the print.
 
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