1. Manufacture of Silver.Plunge Cyprian copper, which is well worked and shingled for use, into dyer’s vinegar and alum and let soak for three days. Then for every mina of copper mix in 6 drachmas each of, earth of Chios, salt of Cappadocia and lamellose alum, and cast. Cast skillfully, however, and it will prove to be regular silver. Place in it not more than 20 drachmas of good, unfalsified, proof silver, which the whole mixture retains and (this) will make it imperishable.