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<p>[QUOTE=&quot;Cherryhill, post: 3698823, member: 70&quot;]Uh... Machine etched....not really. School Time</p><p><br /></p><p>Etched glass is produced by acid etching into the surface of the glass. Almost all etched glass is produced by covering the surface of the glass with a &quot;resist&quot;, a waxy stuff that acid won&#039;t attack. Here&#039;s were it gets tricky. When most glass is etched, (with a major exception) its surface is covered with a resist that has been prepared by being rubbed into an &quot;Etching plate&quot; a steel plate with a design engraved into it. (usually photo-engraved). The entire surface is inspected for gaps and covered with more resist, inside and out. Then the glass is immersed in acid (generally hydrafloric acid) The acid eats the glass, but not the resist. Once done, minutes or hours, I don&#039;t know, the glass is removed from the acid and cleaned with hot water which melts the wax, revealing the design.</p><p><br /></p><p>The design above is somewhat different. It&#039;s called Needle Etching, The glass is covered with resist, totally covered. The glass&nbsp; (tumbler in this case is placed on a machine which with a needle draws the design on the tumbler through the resist. The acid does the same job, the wax is removed and the tumbler is finished.</p><p><br /></p><p>The Needle etching process was developed before the photo-engraved process. Prior to this time etching plates were not used, the designs were hand drawn with needles, through the resist, directly on EACH piece, before the acid etching, adding much cost to the product.</p><p><br /></p><p>School&#039;s out.[/QUOTE]</p><p><br /></p>

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