Correction Pens
More recently, correction fluid has become available in pen form; the pen is spring-loaded and, when dabbed onto the paper, releases a small amount of fluid. If the pen does dry out, a few vigorous shakes usually get the fluid to flow again. Compared to the bottled form, the pen allows a more even and thin application, and is less prone to drying out (since only a tiny surface is exposed during application) or clogging.
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—Horace Walpole (17171797)
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—J.L. (John Langshaw)