Democratic Sentinel, Volume 17, Number 32, Rensselaer, Jasper County, 25 August 1893 — A New Prepared Paper. [ARTICLE]

A New Prepared Paper.

In Germany a patent has been refused, and the manufactuie and sale have been prohibited, of a paper so prepared that any ink-writing upon its surface could be erased by the simple application of a moist sponge. The paper was made of the ordinary ingredients, with the addition of asbestos and parchment glue. The paper pulp, after rolling, was immersed for a short time (from six to thirty-five seconds, according to the thickness of paper to be prepared from it) in concentrated sulphuric acid at twenty degrees diluted with ten to fifteen per cent, of water. I< was then pressed between glass rollers, passed successively through water, ammonia solution, and a second time through water, strongly pressed between rollers and dried on felt rollers, and, finally, on polished and heated metal rollers. The finished article is said to be precisely like ordinary paper. Its sale has been prohibited on account of the misuse to which it could be put.