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The fox in Basil Valentine's Third Key represents aqua regia, Musaeum Hermeticum, 1678. The third of Basil Valentine's keys (c. 1600) shows a dragon in the foreground and a fox eating a rooster in the background. The rooster symbolizes gold (from its association with sunrise and the sun's association with gold), and the fox represents aqua regia.
Generally, the preparation of this material involves gold being dissolved in aqua regia, then reacted with a solution of tin(II) chloride. The tin(II) chloride reduces the chloroauric acid from the dissolution of gold in aqua regia to a colloid of elemental gold supported on tin dioxide to give a purple precipitate or coloration.
After removing the solid gold other elements like silver and copper may be extracted from the liquid. To get the gold to a very high level of purity (999 fine gold) it is sometimes processed further with aqua regia to effectively remove all the impurities. Aqua regia was also used for parting.
A visualization of the aqua fortis (nitric acid) and aqua regia acid tests on zinc, copper, silver, and gold. Testing for gold with acid capitalizes on gold's status as a noble metal, resistant to corrosion, oxidation, or acid. The procedure includes rubbing the gold-colored item on black stone, leaving a visible mark.
Aqua regia (HNO 3 + 3 HCl) Fenton's reagent (H 2 O 2 + Fe 2+) Green death (xH 2 SO 4 + yHCl + zFeCl 3 + wCuCl 2) Peroxydisulfuric acid, or Marshall's acid (H 2 S 2 O 8) Peroxymonosulfuric acid, or Caro's acid (H 2 SO 5) RCA clean (silicon wafer cleaning procedure) Chromic acid (H 2 CrO 4) Superhydrophilicity; Ultrahydrophobicity
4 Color of aqua regia. 6 comments. 5 disactivation of Acqya regia. ... 11 Importance of elemental chlorine in the dissolution of gold. 2 comments ...
While Saudi Arabian athletes have some of the best winnings to aspire to, Hong Kong is close behind. It paid two of its gold-medalist fencers about $770,000—and a lifetime supply of free tickets ...
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