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Thermography is often used as an inexpensive alternative to engraving. Both give a slightly raised impression. You can often differentiate them by looking for a slight recess of the back of the paper caused by pressure during the engraving process. Thermographed printing won't show any marks on the back of the paper.
Ther*mog"ra*phy (?), n. [Thermo- + -graphy.]
Any process of writing involving the use of heat.
© Webster 1913
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