U of S | Mailing List Archive | alt-photo-process-l | Strength of bleach

Strength of bleach

John Grocott wrote
''This  bleach method has worked very well for me for many years, probably because  gum is not used in my Direct Carbon process. At the dilution of 25ml to 1 Litre water (1/40 th) there is practically no odour. Not even as much as when its used in the washing of clothes and drains etc., in the houshold.''
The label on my concentrated bleach bottle states ''Contains less than 5 % chlorine based bleaching agent.
Loris, you say here you have 55 % bleach. Is it houshold stuff you buy in the supermarket ?  Or something mixed up in your lab ? I have never seen such a high strength bleach, anywhere ! !
 Please could you check ?
                   Ciao. John - Photographist - London - UK
----- Original Message -----
From: "Loris Medici" <mail@loris.medici.name>
Sent: Saturday, December 01, 2007 6:11 PM
Subject: Re: Bleach-development with gum

> Quoting Katharine Thayer <kthayer@pacifier.com>:
>> ...
>> It's interesting to me that
>> such a strong bleach you're using doesn't just take the image right off
>> the paper.
>> ...
> Well, since I dilute it by mixing 20ml into 1000ml of water, the 
> actual strength is something like 1%. I can barely sense the odor of 
> hypochlorite when it is so much diluted (it would cause me to 
> vomit/faint otherwise).
> Regards,
> Loris.