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<p>[QUOTE=&quot;krispy, post: 1327307, member: 19065&quot;]I will suggest that the random &#039;pattern&#039; of where these concentrations appear, appear in areas of the unprinted note, for the most part, but do deviate to some areas of printed design. Therefore, are easily spotted when someone glanced at these notes and upon seeing the security feature present had a highly probably authentic note. If the threads were buried under printed elements of the note, they would need to stop and use a magnifying glass to see if embedded fibers were present under more heavily concentrated areas of printed design elements. </p><p><br /></p><p>Simply, the fibers appear where they don&#039;t get covered up by printing (as much) and the fibers themselves don&#039;t interfere so much with the seals, portraits and vignettes, etc. I&#039;m suggesting that they intentionally laid down a trail of fibers in empty regions on the paper where they knew design elements would not be printed, rather than muddying up the face of the President by putting fibers in that region, as an example. </p><p><br /></p><p>The nearer you get to modern times, the smaller the threads have become, almost requiring a magnifying glass to find them present in the paper, and being less evident to the naked eye, they then appear distributed more widely throughout the paper, less distracting to the notes printed designs. </p><p><br /></p><p>It may be the case that the earlier uses of the silk fibers, say in 19th century US currency, were cruder, larger bits of fiber, first devised to be applied to the wet paper pulp sheets during production when the wet pulp was going to be taken off the screens and placed on a press to wring out the water from the wet pulp to dry. With modern paper pulp mixing machinery perfecting the process, allowing total control over the recipe and precision paper making, along with industrial scale paper making machinery producing huge rolls of banknote papers, the technology to reduce the size of the threads and distribute them more evenly, without effecting the final result of the printed note, may explain the progression of thread technology relative to inclusion and their size plus effectiveness.</p><p><br /></p><p>You are right indeed to wonder about secrecy, Crane &amp; Co. keeps the paper recipe under strict confidence for security reasons.[/QUOTE]</p><p><br /></p>

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