1. Magenta, 1 oz. to the gallon of boiling distilled water. 2. Violet: 1/2 oz. to a gallon ditto. 3. Blue: 1 oz 9 pts. ditto. 4. Green: 1 oz. to 5 pta. ditto.
The addition of a small quantity of vinegar will considerably improve the color of blue aniline fluid. These aqueous solutions are very enduring, though not exactly permanent, as they give way to long-continued exposure to sunlight. They are very limpid, dry quickly, and never clog. They should of course be filtered.
Grind gold-leaf with honey in a mortar until it is reduced to a fine powder. Wash out the honey with hot water and add mucilage of gum arabic. A cheap article may be made by using yellow bronze powder.
Prepared in the same way as gold ink, using silver leaf or silver bronze powder.
Dissolve 1/4 oz. nitrate of silver in 1 oz. water and add strong liquid ammonia until the precipitate which is at first formed is redissolved. Add 1 1/2 drachms gum mucilage and enough coloring ma er to render the writing clearly visible. The writing is made black and indelible by passing a hot iron over it. Keep in the dark.
Triturate 13/4 grammes of aniline-black with 60 drops of strong hydrochloric acid and 42 or 43 grammes strongest alcohol; then add to it a hot solution of 2 1/2 grammes gum arabic in 170 grammes of water.
This ink attacks steel pens but little. It is not destroyed either by strong mineral acids or by strong lye.
If the first alcoholic solution of aniline black be diluted with a solution of 2^ grammes of shellac in 140 grammes of alcohol (instead of gum arabic in 170 grammes of water) an ink is produced which may be employed for writing on wood, brass or leather, and which is remarkable for its deep black color.
Draughtsmen are well aware of the fact that bines drawn on paper with good India ink which has been well prepared, can not be washed out by mere sponging or washing with a brush. Now, however, it is proposed to take advantage of the fact that glue or gelatine, when mixed with bichromate of potassa, and exposed to the light, becomes insoluble, and thus renders India ink, which always contains a little gelatine, indelible. Reisenbichler, the discoverer, calls this kind of ink "Harttusch," or "hard India ink;" it is made by adding to the common article, when making, about one per cent., in a very fine powder, of bichromate of potash This must be mixed with the ink in a dry state; otherwise, it is said, the ink could not be ground up easily in water. Those who can not provide themselves with ink prepared as above in the cake, can use a dilute solution of bichromate of potash in rubbing up the ink; it answers the same purpose, though the ink should be used thick, so that the yellow salt will not spread.
An ink that can not be erased with acids is obtained by the following recipe: To good gall ink add a strong solution of fine soluble Prussian blue in distilled water. This addition makes the ink, which was previously proof against alkalies, equally proof against acids, and forms a writing fluid which cannot be erased without destroying the paper. The ink writes greenish blue, but afterwards turns black.