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<p>[QUOTE="SteveInTampa, post: 1564305, member: 27107"]The silk used in U.S. currency paper was used only for the distinctive identifying red & blue fibers. The main formula was 75% linen and 25% cotton. Starting with the outbreak of WWI in Europe (1914), Great Britain placed an embargo on the export of linen cuttings. As a result, the distinctive paper contractor (Crane) was unable to secure adequate stocks of such cuttings. Consequently, by the fall of that next year the Treasury Department authorized the contractor to substitute cotton in place of one-third of the linen formerly used. As hostilities increased, a reduction to 50 percent in the linen content became necessary and by the end of July 1917 this ingredient had to be reduced to 25 percent. By the close of 1917, the world supply of of linen for nondefense purposes was such that the Government had to resort to the use of paper made entirely of cotton. This was used until March 1921 when the supply of linen on the market was sufficient to warrant restoration of the 50/50 formula. In July 1922, the linen content was further increased to 75 percent and then 100 percent by the following spring. Experience showed that this all linen paper was not as satisfactory from the standpoint of printing and wear qualities as that made with 25 percent cotton. In September 1924 the BEP returned to the stock formula of 75 percent linen and 25 percent cotton. The shortage of the world supply of silk took place in April 1942, and the distinctive fibers were originally replaced by nylon fibers. A year later, April 1943, nylon was in critically short supply and the Government had to resort to colored cotton threads of the distinctive features. This type of thread (cotton) was used until it was replaced by another synthetic fiber in 1950.[/QUOTE]</p><p><br /></p>
[QUOTE="SteveInTampa, post: 1564305, member: 27107"]The silk used in U.S. currency paper was used only for the distinctive identifying red & blue fibers. The main formula was 75% linen and 25% cotton. Starting with the outbreak of WWI in Europe (1914), Great Britain placed an embargo on the export of linen cuttings. As a result, the distinctive paper contractor (Crane) was unable to secure adequate stocks of such cuttings. Consequently, by the fall of that next year the Treasury Department authorized the contractor to substitute cotton in place of one-third of the linen formerly used. As hostilities increased, a reduction to 50 percent in the linen content became necessary and by the end of July 1917 this ingredient had to be reduced to 25 percent. By the close of 1917, the world supply of of linen for nondefense purposes was such that the Government had to resort to the use of paper made entirely of cotton. This was used until March 1921 when the supply of linen on the market was sufficient to warrant restoration of the 50/50 formula. In July 1922, the linen content was further increased to 75 percent and then 100 percent by the following spring. Experience showed that this all linen paper was not as satisfactory from the standpoint of printing and wear qualities as that made with 25 percent cotton. In September 1924 the BEP returned to the stock formula of 75 percent linen and 25 percent cotton. The shortage of the world supply of silk took place in April 1942, and the distinctive fibers were originally replaced by nylon fibers. A year later, April 1943, nylon was in critically short supply and the Government had to resort to colored cotton threads of the distinctive features. This type of thread (cotton) was used until it was replaced by another synthetic fiber in 1950.[/QUOTE]
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