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In addition to watermarks and different kinds of paper,collectors identify their stamps by the texture or color ofthe papers upon which they are printed. Hence, we have"granite" paper and "silk" paper, both of which are madefrom paper in which small particles of silk thread areintroduced into the pulp. When these pieces of threadare so well chopped up as not to be discernible to the eyethe paper is called "granite," and when the silk threadsare merely short pieces, such as may be seen in anydollar bill, the paper is known as "silk."
In Great Britain a special paper was used for the first,"Mulready," envelopes and for some other stamp issues.This was a paper into the pulp of which had been in-troduced a continuous silk thread or threads. Sometimesthis is called "Dickinson" paper after the name of theinventor of the process but usually it is known to col-lectors as "paper with silk threads." |
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