Embossing

Embossing is a raised design on paper. Two closely matching dies are used under pressure to create a permanent image. This has been used as a security device since it is hard to imitate, although embossing has been forged as in the case of Sardinia.

 File:Two Sic embos.webp|Sicilian stamp with embossed head File:Sardinia newspaper.jpg|fancy "2" on Sardinian stamp 

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