During the 1860s, the US postal authorities became concerned about postage stamp reuse.

Since poor-quality ink could be washed from the stamp, this method would only have been moderately successful. A number of inventors patented various ideas to attempt to solve the problem.
The Post Office eventually adopted the grill, a device consisting of a pattern of tiny pyramidal bumps that would emboss the stamp, breaking up the fibers so that the ink would soak in more deeply, and thus be harder to clean off.

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