| 摘要 |
A process for hectographic duplicating, and hectographic copy paper therefor, are disclosed. The hectographic copy paper is formed by applying a coating of a film-forming vehicle and a colourless dyestuff precursor which is sodium p-carboxy phenyl leucauramine, sodium p-sulphophenyl leucauramine of Michler's hydrol methyl ether. The sheets are used to type or otherwise form an imaged hectographic master sheet, which is then contacted with hectographic copy sheets moistened with a spirit duplicating fluid, with the dyestuff precursors converted into dyestuffs on the hectographic copy sheets.
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