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Improvement in Ink-Erasers

The Great Lightning Ink-Eraser may be used instead of a knife or scraper for erasing ink, in order to rectify a mistake or clean off a water-mark, which can only be produced when the paper is in a state of pulp; consequently the forger must procure a mould, and make his own paper, both requiring the skill of such first-rate artisans as are not likely to blot without injury to the paper, leaving the be met with in the haunts of crime. By the paper as clean and good to write upon as it three deckle or rough edges. These edges was before the mistake or blot was made, and are produced when the paper is in pulp; two without injury to the printer's ink upon any notes being placed in the mould, and divided printed form, or the ruling upon any first-class lengthways, hence the top and bottom, or paper. Take of chloride of lime 1 pound, long edges, are both rough. The deckle is the raw edge of the paper, and cannot be imi-move as much of the moisture as possible tated by cutting. By the strength of the pa- with clean blotting paper, then place the enpor-a bauk note will lift a hundred weight if graving in a press between clean white paper. carefully adjusted. The printing is of two If very much soiled, a repetition of the operakinds, type and plate; the paper is moistened tion may be necessary. by water driven through its pores by the 6401. Fine Black Hair Dye. This is pressure of the atmosphere; 30,000 double composed of two different liquids, No. 1, notes are thus moistened in the space of an called the mordant, which is employed to give hour. The ink used is made at the bank, permanency to the dye, and No. 2, which is from linseed oil and the charred husks and the dye itself. Take 1/4 ounce pyrogallic acid, vines of Rhenish grapes; this gives a pecu- 6 ounces alcohol, and 18 ounces water; shake liar velvety black to the mark in the left-hand them well together, and put the mixture in a corner of the note. The notes are numbered glass-stoppered bottle. This is the mordant, by a machine which cannot err; and, lastly, are authorized by the signature of the clerk.

The bank notes are printed on the side of the paper which receives the water mark, so that, if the paper be split, the unprinted surface only retains the slightest trace of that mark. 6397. To Flatten Engravings or Paper that has been Rolled Up. To succeed in this, take a roll of paper, wall-paper for instance, unroll a portion of it, and insert the paper or card-board, which is to be flattened, in such a manner that when the whole is rolled up again, the card-board will be bent the opposite way to which it was originally and must be labeled Solution No. 1. To prepare the dye, take 1 ounce nitrate of silver, 2 ounces ammonia, and 8 ounces distilled water; dissolve in a stoppered bottle, and mark it Solution No. 2.

This is a very fine article. (See No. 1201.) Directions for using the above dye may be found in No. 1202.