Distil 2 lb. of saltpetre and 1 lb. of copperas.
Saltpetre, 6 lb., copperas, 6 lb. in its usual crystallised state, together with 3 lb. calcined to redness.
Strong aquafortis, 1 oz. by measure, and water 9 oz. by measure.
The same as Assayer's Acid.
Double aquafortis, 16 oz.; common salt, 1 dram: distil to dryness, Aqua-regia.
(a) Distil together 16 oz. of spirit of nitre, with 4 oz. of common salt.
(6) Equad parts of nitric acid and muriatic acid mixed.
(c) Nitric acid 2 parts, and muriatic 1 part.