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US 5,202,470 AGranted
Hydrazinium sulphosalicylate
OwnerErich Rufinventor
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Abstract
The invention provides a compound of the formula [NH.sub.2 NH.sub.2 ].sub.a [C.sub.6 H.sub.3 (COOH) (SO.sub.3 H) (OH)].sub.b wherein a is 1 and b is from 1 to 2. The compound is useful for stabilizing tin (II) compounds against oxidation, in particular in the electrolytic coloring of aluminium or aluminium alloys.
Claims3
A composition of the formula ##STR1## where a is 1 and
- b has a value of from 1 to 2.
Dependencies are inferred from the claim text.