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Many other stamps have been printed by lithography—a method of printing which, during the past generation,has seen enormous gains in technique and is far removedfrom its original processes as discovered by Alois Sene-felder about 1800. The process depends upon the natural phenomenonthat grease or fatty substances will repel water whileother substances will "hold" water. Senefelder discoveredthat certain kinds of stone would soak up water. Bydrawing a design or printing words on the stones witha fatty-substance ink, he had what proved to be a verysatisfactory printing machine. After the words had beendrawn the stones were immersed in water. The fatty ink |
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