Aqua regia



a yellow, fuming liquid composed of one part nitric acid and three to four parts hydrochloric acid: used chiefly to dissolve metals as gold, platinum, or the like.
Historical Examples

The “platinum chloride” of the laboratory is made by dissolving platinum in aqua regia.
An Elementary Study of Chemistry William McPherson

If the precipitate fails to dissolve, it is treated with aqua regia.
Legal Chemistry A. Naquet

Fuming hydrochloric acid and aqua regia attack thorium readily, but the alkalies are without action.
Scientific American Supplement, No. 365, December 30, 1882 Various

Oxidise sulphur by aqua regia, and reduce silver chloride as in III.
Cooley’s Practical Receipts, Volume II Arnold Cooley

When solutions in aqua regia are evaporated, chlorides are left.
A Textbook of Assaying: For the Use of Those Connected with Mines. Cornelius Beringer and John Jacob Beringer

Dissolve in aqua regia, and product after evaporation will be found better for toning than that precipitated by iron.
Cooley’s Practical Receipts, Volume II Arnold Cooley

I found a seven-shilling piece partly dissolved by the aqua regia in which it was immersed.
Shelley at Oxford Thomas Jefferson Hogg

Wash insoluble part with ammonia to remove silver chloride, if present, and dissolve in aqua regia.
Cooley’s Practical Receipts, Volume II Arnold Cooley

They produced sulphuric and nitric acids, and aqua regia, able to dissolve gold, the king of metals.
An Introduction to the History of Science Walter Libby

A metal discovered by Claus, associated with iridium, in the residue from crude platinum, which is insoluble in aqua regia.
Cooley’s Practical Receipts, Volume II Arnold Cooley

noun
a yellow fuming corrosive mixture of one part nitric acid and three to four parts hydrochloric acid, used in metallurgy for dissolving metals, including gold Also called nitrohydrochloric acid
aqua regia
(rē’jē-ə, rē’jə)
A corrosive, fuming, volatile mixture of hydrochloric and nitric acids. Aqua regia is used for testing metals and dissolving platinum and gold.

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