qua-regia defined in 1909 year

qua-regia - qua-regia;
qua-regia - This is a mixture of nitric and hydrochloric acids. (Nitric acid is sometimes called spirit of nitre, while hydrochloric acid' is often called muriatic acid, or spirits of salts.) The name Aqua-Regia was given by the alchemists owing to the power this mixture has of dissolving gold, platinum, etc., which neither of the two acids named will do separately.

(a) Distil together 16 oz. of nitric acid with 4 oz. common salt.

(b) Mix together equal parts of nitric acid and hydrochloric acid.

(c) Nitric acid 1 part, and hydrochloric 2 parts.

Of the above (c) is most effective.

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