alnovo@inwind.it
Date: 07/31/01-12:55:13 AM Z
> when someone gets a really heavy green stain
> that the bi's and meta's won't clear, then sulfuric acid is necessary. I
> speak not from experience, since I never see these stains myself, but am
> only passing on what others have told me.
> Katharine Thayer
>
In fact, Cr (III) is soluble only in an acidic environment, that cannot be given by bisulphite.
This last, instead, is neccessary to reduce the residual dichromate, again in an acidic solution.
Alberto
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