> Terry - re: h202 probs w/ oxalate
> I'd wonder about the stirrer or contamination. The difference between 28.5%
> and 30% peroxide is just a little water, and either should be concentrated
> enough to oxidize the ferrous to ferric.
>
> Alternate sources for conc. peroxide:
> Grau-Hall
> Sargent Welch
> Aldritch
> Sigma
>
> and occassionaly: prof. beautician's supply shops (they carry it for mixing
> down perm solution/bleaching solution I think, don't know about purity
> though)
>
> Good luck,
> Tox
> PS: How has the technique been working for you? I've just finished rereading
> the Stevens book, and have been thinking about getting into it once I have
> contact neg material. The peroxide method looked "cleanest" to me, would be
> curious about your experiences with it.
>
> ***********************************************
> * Tox Gunn .......tox@remarque.berkeley.edu *
> * "Your sanity is not my responsibility!" *
> ***********************************************
>
Good point about 28.5% vs 30%, as its job is to oxidise. BTW, Terry, I
have a bottle of "food grade" hydrogen peroxide from a health food store
that is listed as 35%. It is supposed to help you lose weight if you
drink a glass of water with a few drops in it. Don't count on the weight
loss, but maybe try a health food store, they might not know they are not
supposed to sell strong hydrogen peroxide.
good luck,
john