This is done by means of fusible metal. In order to show the application of it, paste a piece of paper on the bottom of a China saucer, and allow it to dry; then write upon it with a common writing ink, and sprinkle some finely powdered gum Arabic over the writing, which produces a slight relief. When it is well dried, and the adhering powder brushed off, the fusible metal is poured into the saucer, and is cooled rapidly, to prevent crystallization. The metal then takes a cast of the writing, and, when it is immersed in slightly warm water to remove adhering gum, impressions may be taken from it as from a copper-plate.
Put a little sugar into a common writing ink and let the writing be executed with this upon common paper, sized as usual. When a copy is required, let unsized paper be taken and lightly moistened with a sponge. Then apply the wet paper to the writing, and passing lightly a flat-iron of a moderate heat, such as is used by laundresses, over the unsized paper, the copy will be immediately produced. This method requires no machine or preparation, and may be employed in any situation.
_To Produce a Fac-simile of any Writing._
The pen should be made of glass enamel; the point being small and finely polished; so that the part above the point may be large enough to hold as much ink as, or more than a common writing pen.
A mixture of equal parts of Frankfort black, and fresh butter is now to be smeared over sheets of paper, and rubbed off after a certain time. The paper, thus smeared, is to be pressed for some hours, taking care, to have sheets of blotting paper between each of the sheets of black paper. When fit for use, writing-paper is put between sheets of blackened paper, and the upper sheet is to be written on, with common writing-ink, by the glass or enamel pen. By this method, not only the copy is obtained on which the pen writes, but also two or more, made by means of the blackened paper.
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