Word: chollar
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Dates: during 1950-1959
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...take-off point, says Robert G. Chollar, research chief of the National Cash Register Co. at Dayton, was a trick paper coated with clay on one side and with a special colorless ink on the other side. When the sheets were superimposed and written or typed on, the clay and ink were forced into contact. The ink turned deep blue, making a "carbon copy" without carbon, but the paper was no good because in time the ink seeped through it, making unauthorized contact with the clay and staining the paper blue...
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