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Updated: May 6, 2025
Every sample was tested and minutely examined; the prices, from three to ten francs per ream, were noted on each separate slip; some were sized, others unsized; some were of almost metallic purity, others soft as Japanese paper; in color there was every possible shade of white. If old Sechard and the two Cointets had been Jews examining diamonds, their eyes could not have glistened more eagerly.
When catalogued, the title-page or beginning of each pamphlet in the volume, should be marked by a thin slip of unsized paper, projected above the top of the book, to facilitate quick reference in finding each one without turning many leaves to get at the titles.
The explanation is that the ink changes in time, its organic substance disappears little by little, and leaves behind an iron compound, which in part is not attacked even by acids. An unsized paper is impregnated with the described diluted acid, copied with the press, and a copy from writing eight or ten years old can be obtained as easily as one by means of water from a writing one day old.
For some years this fabrication had been making considerable progress. Unsized paper, with the sheets impregnated with dextrin and starch and squeezed in hydraulic presses, will form a material as hard as steel. There are made of it pulleys, rails, and wagon-wheels, much more solid than metal wheels, and far lighter.
While Boniface Cointet was in Paris, David made a first experimental batch of unsized paper far superior to that in common use for newspapers. He followed it up with a second batch of magnificent vellum paper for fine printing, and this the Cointets used for a new edition of their diocesan prayer-book.
When a copy is required, moisten a piece of unsized paper lightly with a sponge, and apply it to the writing; then smooth the wet paper over with a warm iron, such as is used in a laundry, and the copy is immediately produced without the use of a machine. COPYING PRINTS. Moisten a piece of paper with a solution of soap and alum, lay it on the print or picture, and pass it under a rolling press.
This fact gave color to the Cointet's urgency upon the point of sizing in the pulping-trough; but, as a matter of fact, they cared nothing for this part of David's researches. The demand for writing-paper is exceedingly small compared with the almost unlimited demand for unsized paper for printers.
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