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Updated: May 3, 2025
In regard to the chemicals used to erase ink, much depends upon the ink. For most writing fluids and copying inks which are in daily use, a saturated solution of chloride of lime is the best eraser known, and when properly made is very quick and effective in its work. It may be applied with a glass pointed pen, to avoid corrosion, or with a clean bit of sponge.
If men were wise, they would use those patent inks, which fade from the paper in a few days. I followed his example, and, among other strange discoveries, I made this one." He took from his desk a piece of paper ragged, dirty, and creased and, handing it to Hortebise and Paul, said, "Read!" They did so, and read the following strange word: "TNAFNEERTONIOMZEDNEREITIPZEYAETNECONNISIUSEJECARG;"
I have several times mentioned precautions against such abuses in the shape of fine engraving, watermarks, enameled paper, sensitive inks, etc. There are numerous other devices which have been used with the same end in view. The patterns here shown were printed on the backs of the stamps in blue ink. The first is a band of interlaced lines, called a burelage.
If the same solution be used in place of water, as in the ordinary letter-copying process and the copying paper be saturated with it, the result will be the same. To determine the age of writing by applying bleaching acids and watching results and counting the seconds is a dangerous method. Thick inks will respond to the acids slower than thin, and the time comparisons are misleading.
The inks used, the position of the writing, the paper on which it is written, the employment of certain chemical, mechanical and clerical preventatives are all to be thoughtfully considered by those who desire to protect themselves against losses resulting from fraudulent handwriting.
The atmosphere has been becoming more and more charged with the character of the printing business. Now may be felt the tremour and heard the sound of moving presses. Printing houses, dealers in "litho inks," linotype companies, paper makers, "publishers and jobbers of books," "photo engraving" establishments are all about.
The former are destined to be smothered in official stamps and coloured inks, while the latter are cast ignominiously into the gigantic waste-paper basket. Though this little sheep, in particular, may have a little of its wool shorn off, I trust that it may eventually avoid the rubbish heap.
Thus it is precisely as in civilized countries, where those who have houses and lands are incessantly bored to death with invitations to come and live in other people's houses; while many a poor gentleman who inks the seams of his coat, and to whom the like invitation would be really acceptable, may go and sue for it.
The older ink will resist the action of the ammonia longer and give up less soluble matter than the newer writing. Nutgall, and logwood inks, of course, should not be tested comparatively by this method, as the logwood ink will respond to the ammonia sooner than the nutgall ink. F. Carré also gives another method for determining, approximately, the age of ink-writings.
On the Monday after her change of home, Sarah Brown found that the glory had gone out of the varied inks, and even a new consignment of index-cards, exquisitely unspotted from the world, failed to arouse her enthusiasm. This was partly because the first name in the index that she looked up was that of Watkins, Thelma Bennett, single, machinist.
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