Stabilized nitric acid compositions

Etching a substrate: processes – Nongaseous phase etching of substrate – Etching inorganic substrate

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216106, 252 792, 423265, 4233901, C23F 116, C23F 118

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active

057414327

ABSTRACT:
A composition that includes an aqueous solution of nitric acid and an additive having the formula ##STR1## or a salt thereof, in an amount sufficient to improve the oxidative stability of the aqueous nitric acid solution relative to the oxidative stability of that aqueous solution in the absence of the additive.

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