Thermography is a cost-effective alternative to achieve a raised effect similar to engraving. Thus the reason why it is often called “imitation engraving” or “poor man’s engraving”.
Thermography is a heat activated process. A special unit is attached to the offset press and after the original printing process, while the ink is still wet, the paper is transported through the thermography unit.
Next, the whole sheet is spread with a special thermography powder. While the small granulates stick to the wet ink, a vacuum sucks the loose granules up and stores them for re-use. The powder is now fused with heat into a raised, usually glossy, enamel-like look.
The actual thermographed area has a slick, waxy feel to it.
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