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There are, of course, a great many processes of print-ing that come under the general heading of relief orletterpress printing, many of which have been used toproduce postage stamps. Techniques of operation differin different countries and in different printing establish-ments. It is pointless to try and review them all hereeven if the author were qualified to do so. There is,however, one process that requires explanation for thecollector of United States and other stamped envelopes.This is called "embossing." Embossing Embossing, the method used to produce all Govern-ment stamped envelopes of the United States and severalother countries, is basically letterpress printing. It differsonly in that the uninked portions of the printing die |
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