To silver by heat. Disso

lve an ounce of pure silver in aqua fortis, and precipitate it with common salt; to which add 3 lb. of sal ammoniac, sandiver, and white vitriol, and £ oz. of sublimate.  Another method.—Dissolve an ounce of pure silver in aqua fortis; precipitate it with common salt, and add, after washing, 6 ounces of common salt, 3 ounces each of sandiver and white vitriol, and £ ox. of sublimate.  These are to l.»i ground into a paste upon a fine stone with a muller; the substance to be silvered must be rubbed over with a sufficient quantity of the paste, and exposed to a proper degree of heat. Where the silver runs, it is taken from the fire, and dipped into weak spirit of salt to clean it miveiing on gilt work, by amalgamation. Silver will not attach itself to any metal by amal gamation, unless it be first gilt. The process, is Lie same as gilding in colours, only no acid aho tid tie used.  To silver in the cold way. Take two drachms of each, tartar and commnn salt; $ a drachm of alum, and 20 grains of silver, precipitated from the nitrous acid by copper; make them into a paste with a little water. This is to-be rubbed on the surface to be silvered with a cork, btc.  Another method.—Dissolve pure silver in aqua fortis, and precipitate the silver with common salt; make tins precipitate into a paste, by adding a little more salt and cream of tartar. It is applied as in the former method.  To separate the silver fromCheap Beats By Dre plated copper. This process is applied to recover the silver front the plated metal, which has been rolled down for buttons, toys, &c. without destroying' any large portion of the copper. For this purpose, a menstruum is composed of 3 pounds ot oil of vitriol, l£ ounce of nitre, and a pound of water. The plated metal is boiled in it till the silver is dissolved, nd then thhttp://www.cheap-beatsbydressale.com/ .e silver is recovered by throwing common salt into the solution.  To assay plated metals. Take a determinate quantity of the plated metal; put it into an earthen vessel, with a sufficient quantity of the above menstruum, and place Discount Beats By Dre it in a gentle heat. When the silver is stripped, it must ueCheap Dre Beats Headphones collected with common salt; the calx must ~e tested with lead, and the estimate mad., according to the product of silver.  To plate iron. Iron may be plated by three different modes.  1st. By polishing tne surface very clean and level with a burnisher; and afterwards by exposing it to a blueing heat, a leaf of silver is properly placed and carefully burnished down. This is repeated till a sufficient number of leaves are applied, to give the silver a proper body.  2d. By the use of a solderCheap Beats By Dr Dre; slips of thin solder are  Slaced between the iron and silver, with a little ux, and secured together by binding wire. It is then placed in a clear lire, and continued in it till the solder melts; when it is taken out, and on cooling is found to adhere firmly.  And 3d. By tinning the iron first, and uniting the silver by the intermedia of slips of rolled tin, brought into fusion in a gentle heat.  To heighten the colour of yellow gold. Take of salt pet re, 6 oz. green copperas, 2 oz. white vitriol and alum, of each, 1 oz.  If it be wanted redder, a small portion of blue vitriol must be added. These are to be well mixed, and dissolved in water as the colour is wanted. To heighten the colour of green gold. Take of salt petre, 1 oz. lOdwts. sal ammoniac, 1 oz. 4 dwts. Roman vitriol, 1 oz. 4 dwts. verdigris, 18 dwts. Mix them well together, and dissolve a portion in water, as occasion requires.  The work must be dipped in these compositions, Applied to a proper heat to burn them off, and then quenched in water or vinegar.  To heighten tlie colour of red gold. To4oz. of melted yellow wax, add, in fine powder, IA oz. of red ochre, l£ oz. of verdigris, calcined titl it yield no fumes, and £ an oz. of calcined boiax; mix them well together. It is necessary to c dcine the verdigris, or else, by the heat applied h burning the wax,