A compleat course of chymistry; containing not only the best chymical medicines, but also great variety of useful observations / [George Wilson].
- George Wilson
- Date:
- 1721
Licence: Public Domain Mark
Credit: A compleat course of chymistry; containing not only the best chymical medicines, but also great variety of useful observations / [George Wilson]. Source: Wellcome Collection.
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![Sulphur, compar’d with that of Gold, can¬ not properly be faid to be fixt; yet with refpefl to other Metals, it may be call’d fixt and incombuftible. Preparations of Silver. , Purification by the Cupel. CE Ta Cupel, made of Bone-Afhes, in V a melting Furnace; make a gradual fire to it, till the Cupel is red-hot; and to every Ounce of Silver you defign to purify, put four Ounces of Lead. When it is melted, (or you may put them in together) put in your Silver to the mid¬ dle of the Tell, keeping Hill a good Fire about it (under a Muffle) til] you fee the Silver lie like a polifh’d Lump in the middle of the Tell; then let it cool, and b^at it from the 1 ell, and it is perfect, fine, and fit for any phyfical Preparation/ The DijJ'ohtion, and Chryfials of Silver. T ? AKE of the cupell’d Silver what • quantity you pleafe, put it into a. leparating Glafs, or Cucurbit; and put to it four times its weight of good Ayua Fortis: fet them in Sand over a gentle Fire,- till the Silver is dilfolved; then evaporate two thirds of the Liquor, add G](https://iiif.wellcomecollection.org/image/b30502603_0057.jp2/full/800%2C/0/default.jpg)
