. The Emporium of arts & sciences. to discover the composition of it. The following is the man-ner in which this chemist thinks it is composed, bating the propor-tions. Soap and strong glue, or any other gelatin, are dissolved inwater. With this solution is mixed a solution of alum, which, beingdecomposed, forms in it a flaky precipitate, composed of oil, alumine,and animal matter. Weak sulphuric acid is then added, to redis-solve a part of the alumine, and to render the precipitate lighter, andto prevent it from falling to the bottom. But the alumine, whenonce combined with the oil and animal
. The Emporium of arts & sciences. to discover the composition of it. The following is the man-ner in which this chemist thinks it is composed, bating the propor-tions. Soap and strong glue, or any other gelatin, are dissolved inwater. With this solution is mixed a solution of alum, which, beingdecomposed, forms in it a flaky precipitate, composed of oil, alumine,and animal matter. Weak sulphuric acid is then added, to redis-solve a part of the alumine, and to render the precipitate lighter, andto prevent it from falling to the bottom. But the alumine, whenonce combined with the oil and animal matter, does not redis-solve entirely in the sulphuric acid; for this reason the oil always re-mains very opake, and neither rises nor is precipitated. It may rea-dily be conceived, that too large a quantity of sulphuric acid mustnot be added. M. Vauquelin does not know whether this be exactlythe process, but by following it he has been able to obtain a similarliquid, which possesses the same properties. Ibid, - - ■, ... ID. E,i„>i,i. fc g%om r //>;//$.?J/32. £%ted f«„e gfar/ff.
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Keywords: ., bookcentury1800, booksubjectindustrialart, booksubjecttechnology
