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Marking Ink (Jules Guillier who received)

Jules Guillier, who received five years' exclusive privilege in Paris for making marking inks, gives the following formulæ. But one preparation is required, and the inventor states that they will not wash out or fade.

No 1. Nitrate of silver, 11 parts; distilled water, 85 parts; powdered gum Arabic, 20 parts: carbonate of soda, 22 parts; solution of ammonia, 30 parts. Dissolve the carbonate of soda, and afterwards the gum (by trituration in a mortar) in the water, dissolve the nitrate of silver in the ammonia and add to the carbonate of soda solution. Heat gently to the boiling point; the ink at first turbid, becomes clear and very dark.

No. 2. Nitrate of silver, 5 parts; distilled water, 12 parts; powdered gum Arabic, 5 parts; carbonate of soda, 7 parts; solution of ammonia, 10 parts. Heat as before, and heat until it has a very dark color. This ink is very black and is suitable for marking by stamps.

To make New Writing look Old.

Take 1 dr. of saffron, and infuse it into pt. of ink, and warm it over a gentle fire, and it will cause whatever is written with it to turn yellow, and appear as if of many years' standing.

To Write on Greasy Paper or Parchment.

Put to a bullock's gall 1 handful of salt, and pt. of vinegar, stir it until it is mixed well; when the paper or parchment is greasy, put 1 drop of the gall into the ink, and the difficulty will be instantly obviated. To Restore Decayed Writings. 1. Cover the letters with solution of ferrocyanide of potassium, with the addition of a diluted mineral acid; upon the application of which, the letters change very speedily to a deep blue color, of great beauty and intensity. To prevent the spreading of the color, which, by blotting the parchment, detracts greatly from the legibility, the ferrocyanide should be put on first, and the diluted acid added upon it. The method found to answer best has been to spread the ferrocyanide thin with a feather or a bit of stick cut to a blunt point. Though the ferrocyanide should occasion no sensible change of color, yet the moment the acid comes upon it, every trace of a letter turns at once to a fine blue, which soon acquires its full intensity, and is beyond comparison stronger than the color of the original trace. If, then, the corner of a bit of blotting-paper be carefully and dexterously applied near the letters, so as to imbibe the superfluous liquor, the staining of the parchment may be in a great measure avoided; for it is this superfluous liquor which, absorbing. part of the coloring matters from the letters, becomes a dye to whatever it touches. Care must be taken not to bring the blotting-paper in contact with the letters, because the coloring matter is soft