INK

(Germ, dinte.) The colouring matter of common writing ink is the tan no gallate of iron, which is suspended in water by gum arabic, a little logwood is generally added to deepen and improve the colour. A good writing ink made as follows — Take six ounces of finely bruised galls, four ounces of gum arabic, four onces of green vitriol, and six pints of soft water. Boil the galls in the water; then add the other ingredients; and mixing the whole well together, keep it in a well-corked bottle, occasionally shaking it. In two months' time carefully pour ofT the ink from the residue into gla bottles, which should be well-corked; few cloves or a drop or two of creosote put into each bottle prevents moulding. The addition of a little sugar to ink gives it a glo , and prevents its drying rapidly and perfectly; so that it is generally used in what is called copying ink, from the writing with which copies may be taken by pre ure. Indian ink is a compound of very fine lampblack and size. It cannot, like common writing ink, be removed by acids but as it does not bite or sink into the paper, it may generally be wiped off with a moist sponge. Printing ink fa made with boiled linseed or nut oil and lampblack. Red ink is solution of alum coloured with brazil wood. Boil two ounces of brazil wood, half an ounce of gum arabic, and a quarter of an ounce of alum in a pint of water for ten minutes; strain the decoction, and set it aside to clear. Sympathetic inks are compounds which when written with will remain invisible till heated; solutions of cobalt thus become blue or green, lemon juice turns brown, and a very dilute sulphuric acid blackens. Marking ink is made as follows:— Di olve one drachm of lunar caustic (fused nitrate of silver) in half an ounce of water previously thickened with a little sap green: write with this upon the linen previously prepared for its reception by the application of a weak solution of carbonate of soda thickened with a little gum arabic, and suffered to dry upon the linen. INLIDANS, Inlidrn. The name of a family of Myriapods, having the inlus or gallv-worm as the tvpe. INNOCENTS' [s. 618]