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<p>[QUOTE=&quot;hontonai, post: 694977, member: 4703&quot;]Traditionally printed sheets were run through the presses as many times as there were individual ink colors being used.&nbsp;&nbsp; Often so-called transparent inks were used, and deliberate overprinting of colors would result in the appearance of additional colors/shades.&nbsp; The mechanical challenges to precisely aligning the sheets for multiple impressions were successfully met many years ago.</p><p><br /></p><p>Usually multi-color printing has been done in a single run on Web presses, with multiple impressions as the paper travels from the roll to the sheet cutter.&nbsp; Alignment problems were pretty much insurmountable with trying to run a web that would re-roll the paper and allow it to be fed through again in the opposite direction with proper registration of the impressions.</p><p><br /></p><p>Your computer will print pictures with many colors and shades at the same time, although you have a limited number of ink cartridges, as a result of programs that open and close ink valves at ultra high speed.</p><p><br /></p><p>Most printing today is still done with traditional presses, but an increasing amount is being produced computer-style.</p><p><br /></p><p>The U.S. Bureau of Printing and Engraving, however, still uses presses that print one color at a time on pre-cut sheets of paper, and I&#039;ve never seen any news stories or internet information indicating that any major world currency printer has abandoned that method.&nbsp; (So far as I know Bureau experimentation with web printing has ended, but I may be wrong on that count.)[/QUOTE]</p><p><br /></p>

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