or stamp,hurt,

Of fbanging Metals.

'75

Now I shall shew how without loss in weight, nor yet the stamp being

Gold and Silver may be diminished :

Srme use to do it with aqua fortis, but it makes the work rough with knots and holes;you shall do it therefore thus: >irew pc wder of brimstone upon he work, and puta candle to it round about, or burn it under your work , by degrees it will c n-snme by burning; strike it with a hammer on the contrary fide, and the iuperfkieswill fall off, as much in quantity as you please, as you uie the brimstone. Nowshall 1 shew how

To separate gold from silver ftps that are gilded:

For it is oft-times a cuflome for Goldsmiths, to melt the vessels and cast them away,and to nuke new ones again j not knowing how without great trouble , to part thegold from the silver, and therefore melt both together. I opart them. do thus:Take salt Ammoniack, brimstone half a part: powder them nne, and anoint thegilded part of the vessel with oyl: then strew on the powder, and take the ves-sel in a pair of tongs, and put it into the fire : when it is very hot, strike it wii h aniron, and the powder shaken will fall into the water, in a platter under it, and tnevessel will remain unaltered. Also it is done

Another way

with quick-silver : Put quick-silver into an earthen veflel with a very wide mouth,and let it heat so long at the fire, that you can endure the heat of it with your finger,put into it: put the gilt plate of silver into it, and when the quick-silver sticks tothe god, take it out and pur it into a Charger, into which the gold, when it iscold, will fall with the quick-silver. Going over this work again , until no moregold appears in the vessel. Then put the gold with the quick-silver that was sha-ken into the Charger, into a linnet, clout, and prels it out with your hands, and letthe quick-silver fall into some other receiver,the gold will stay behind in the rag; takeit and put it into a cole made with a hole in it,blow till it melt, make it into a lump,and boil it in an earthen vessel with a little Stibium , and pour it forth into ano-ther vess 1, that the gold may fall to the bottom, and the Stibium stay atop. Butif you wiil

Fart Gold from a vessel of Brass,

wet the vessel in cold water, and set it in the fire: when it is red hor, quench it incold water ; then scrape off the gold with latin wire bound together.

Chap. IX.

To part Metals without aqua fortis-

B Ecause waters are drawn from salts with difficulty , with loss of time and greatcharges; I shall shew you how to part gold from silver and brass, and silver frombrass, without aquafortis ; but by some casts operations , with little cost ot loss oftime: And first I shall shew how

To part Gold from Silver.

Cast a himo of cold mixr with silver into an earthen vessel, that will hold fire, withthe same weight of Antimony, thus: when the vessel is red hot, and the lump ismelted, and turned about with the force of the fire • cast a little Stibium in, and in alittle rime it will melt also; and when you fee it, cast in the rest of the Stibium, andcover, he vessel with a cover : let the mixture boil, as long as one may repeat theLords prayer: takeaway the veflel with a pair of tongs, and cast it into anotheriron Pyramidal vessel red hot, called a Crucible, that hath in the bottom of it ramsfat; shaking it gently, that the heavier part of gold separated from the silver , may