Take half a pennyweight o1 silver, two pennyweights and a half of copper, three pennyweights and a half of lead, and two pennyweights and a half of muriate 01 ammonia. Melt together and pour into a crucible with twice a; much pulverized sulphur; the crucible is then to be immediately covered that the sulphur may not take fire, and the mixture is to be calcined over a smelting fire until the superfluous sulphur is burned away. The compound is then to be coarsely pounded, and with a solution of muriate of ammonia to be formed into a paste which is to be placed upon the article it is designed to enamel.

The article must then be held over a spirit lamp till the compound upon it melts and flows. After this it may be smoothed and polished up in safety. This makes the black enamel now so much used on jewelry.