1867 Six Hundred Receipts by John Marquart

600 MTSCELLi\NEOUS VALUABLE RECEIPTS.

75

No. 137.

Another cheap Black Ink. Take 1 dracbm prussiate of potash. 1 drachm bichromate of potash. 1 ounce extract of logwood. 1 gallon water.

Mix all together and shake it well ;

when dissolved,

it is fit for use.

No. 138.

How to make Black Printers' Ink, Printers' ink is a real black paint, composed of lampblack and linseed-oil, which has undergone a degree of heat superior to that of common drying The manner of preparing it is extremely sim- Boil linseed-oil in a large iron pot for 8 hours, adding to it bits of toasted bread for the purpose of* absorbing the w^ater contained in the oil ; let it rest till the following morning, and then expose it to the same degree of heat for 8 hours more, or till it has acquired the consistence required ; then add lamp- black worked up with a mixture of oil of turpentine and turpentine. The consistence depends on the degree of heat given to the oil, and the quantity of lampblack mixed up with it; and this consistence is regulated by the strength of the paper for which the ink is intended. The preparation of printers' ink should take place in the open air, to prevent the bad effects arising from the vapour of the burnt oil, and, in particular, to guard against accident by fire. oils. ple.