[Alt-photo] Re: Palladium bleach
marekmatusz at hotmail.com
Sun Jul 21 15:05:46 UTC 2013
One more thing. The ingredients of this reducer keep reacting with each other so it should be made fresh and discarded after use. I would not recommend storing it
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On Jul 21, 2013, at 4:47 AM, "KISS BOB" <bobkiss at caribsurf.com> wrote:
> DEAR MAREK,
> Thanks for this procedure. I have these ingredients which makes this more practical than trying to find (or import) hydrobromic acid here in Barbados.
> I will give it a try and report results but this might take some time as I am working flat out on a large print order.
> On Sun, 21 Jul 2013 01:20:14 +0000
> Marek Matusz <marekmatusz at hotmail.com> wrote:
>> Bob This is an approximate recipe that I have used. I actually do not measure it carefully. Add to 1 liter of water: about 20 cc of 12% K2Cr2O7 solution, followed by about 2 grams of KBr, followed by about 10 cc of concentrated sulfuric acid (be careful as addition of concentrated sulfuric acid could cause local heating or boling). Bath to be used outside or with good ventilation as likely it involves bromine as a reactive agent. Use gloves and goggles, and handle all chemicals with care. Per-wet your print and immerse in the solution. Bleaching should follow in 2-5 minutes, rinse with water and follow with a bath of sulfite or metabisulfite to remove (neutralize) any residual oxidizers. Marek _______________________________________________
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