Re: Strength of bleach
It says Sodium Hypochlorite <55% on the label (absolutely no dot or comma between the fives). But now I believe it's a typo -> since I checked other brands and they're labeled as <5%... The bleach was the cheapest one they've got -> therefore it's "normal" to have a typo in the label. (Not for Europe and/or US but yes for Turkey!) So, I'm using the same strength as you all... Sorry for the confusion -> blame the package/label designer :) Regards, Loris. On 12/1/07 11:36 PM, "Loris Medici" <mail@loris.medici.name> wrote: > Dear John, > > IRC, the label was saying 55% sodium hypochlorite + perfume + > surfactant. It's used by diluting it as following: 1 glass (~ 200 ml) > into 20 l water. It's common household bleach that I purchased in the > supermarket. Will look at the label (closely) once more when I get > home -> maybe I wasn't able see the dot between the fives (the writing > was quite small)... > > Regards, > Loris. > > Quoting John Grocott <john.grocott403@ntlworld.com>: > >> 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> >> To: <alt-photo-process-l@usask.ca> >> 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. >> >> > > >
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