Aquaregia is a highly corrosive mixture of hydrochloric and nitric acids in a 3:1 ratio that can dissolve gold and platinum, making it one of the few reagents able to do so. Anodising is a process used to form a thick oxide layer on aluminum that protects it from corrosion by increasing its resistance. The document discusses aquaregia, a powerful acid mixture, and anodising, a process used to protect aluminum from corrosion through oxide layer formation.

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Aquaregia:
Freshly prepared mixture of concentrated
hydrochloric acid and concentrated nitric acid in
the ratio of 3:1.
Is a highly corrosive, fuming liquid and one of the few
reagents able to dissolve gold and platinum.
Anodising: Process of forming a thick oxide layer of
aluminium that makes it resistant to further
corrosion.

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