Ink, Indel′ible

Syn. Indestructible ink. Prep. 1. Lampblack (previously heated to dull redne in a covered ve el), 1 ⁄ 4 oz.; triturate with good black ink (gradually added), 1 pint. Resists chlorine, weak acids, and weak alkaline lyes, in the cold. 2. (Bezanger.) Lampblack ground in a lye of caustic soda, combined with a mixture of gelatin and caustic soda. Said to be indelible, and to resemble genuine China ink. 3. (Bra con not.) Dantzic potash, 4 parts; tanned leather parings, 2 parts; sulphur, 1 part; water, 20 parts; boil them in an iron ve el to dryne , then raise the heat (constantly stirring with an iron rod) until the whole forms a soft ma , observing that it does not ignite; next di olve the ma in water, q. s., and filter the solution through a cloth. Flows freely from a pen, and resists the action of many chemical substances. 4. ( Carbon ink. ) Genuine Indian ink, rubbed down with good black ink until it will flow easily from a pen. Resists chlorine, oxalic acid, and ablution with a hair pencil or sponge. 5. (Coathupe.) Borax, 1 oz.; shell-lac, 2 oz., water, 18 fl. oz.; boil in a covered ve el until di olved, strain, add of thick mucilage, 1 oz., and triturate it with levigated indigo and lampblack, of each q. s., to give a good colour. After 2 hours’ repose, decant it from the dregs, and bottle for use. Resists moisture, chlorine, and acids. 6. ( French. )— a. From Indian ink, diffused through water acidulated with hydrochloric acid. For quills.— b. From Indian ink diffused through water slightly alkalised with liquor of pota a. For metallic pens. 7. (Herberger.) Wheat gluten (free from starch), q. s., is di olved in weak acetic acid of good pure vinegar, 4 fl. oz.; lampblack (best), 10 or 12 gr.; indigo, 2 or 3 gr.; and oil of cloves, 1 or 2 drops, are then added, and the whole is thoroughly incorporated together. The product is inexpensive, has a beautiful black colour, and resists the action of water, chlorine, and weak acids. Obs. The products of the above formulæ, though called ‘indelible ink’ and ‘indestructible ink,’ are in reality only indelible as compared with common writing ink, as they may all be removed with more or le facility by chemical reagents, a isted by mechanical means. They are intended chiefly for paper, pasteboard, and parchment. No 5 is also used for gla and metal. See Marking ink .