[Alt-photo] Re: Palladium bleach

[KISS BOB]

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.
                    THANKS!
                         CHEERS!
                                BOB


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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