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 :)
On 12/1/07 11:36 PM, "Loris Medici" <email@example.com> 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)...
> Quoting John Grocott <firstname.lastname@example.org>:
>> 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" <email@example.com>
>> To: <firstname.lastname@example.org>
>> Sent: Saturday, December 01, 2007 6:11 PM
>> Subject: Re: Bleach-development with gum
>>> Quoting Katharine Thayer <email@example.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).