[pure-silver] Re: Bleach
- From: harry kalish <hksvk@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 20 Dec 2009 20:20:19 -0500
Thank you, Richard. Very helpful. But just to be a stickler, in both
formulas, I thought iodine is a gas, so cannot be a crystal.(?) So the
drugstore tincture of iodine has to be a solution of some salt (maybe
potassium?) of iodine.
---Harry
On 12/18/09 8:35 PM, "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> wrote:
>
> ----- Original Message -----
> From: "harry kalish" <hksvk@xxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Friday, December 18, 2009 4:40 PM
> Subject: [pure-silver] Re: Bleach
>
>
>> Tim, I have successfully used tincture of iodine straight
>> from the drugstore
>> vial, if my memory serves me. But is there a formula for
>> the iodine bleach
>> to which you refer?
>>
>> BTW, I bought two of your books from Amazon a few months
>> ago. Nice work! And
>> thank you.
>>
>> Harry
>>
> I am not trying to speak for Tim Rudman but will pass
> along my experience and a couple of very old formulas.
> I also have used Tincture of Iodine directly from the
> bottle. I works well but is very fast. I suspect it would be
> more controlable if diluted with some alcohol. Since its a
> medical product it may be diluted in ethyl alcohol (grain
> alcohol) but it might also be isopropyl (isopropanol).
> There are two old formulas for Iodine reducers. One uses
> potassium cyanide as the fixing agent, the uses
> thiocarbamide. The iodide bleach leaves behind silver iodide
> which is hard to fix out. Nonetheless I think treating it
> with rapid fixer will work and is a lot less toxic than the
> cyanide.
>
> Formula No.1
> Iodine-Cyanide Reducer
>
> Iodine Stock Solution
> Water 160.0 ml
> Potassium iodide 8.0 grams
> Iodine crystals 8.0 grams
>
> Working Solution
> Sodium or Potassium cyanide 5.0 grams
> Iodine Stock Solution 49.0 ml
> Water to make 1.0 liter
>
> The iodine stock solution will keep for several months,
> the working solution does not keep and should be used
> immediately after mixing.
>
> Formula No.2
> Iodine-Thiocarbamide Reducer
>
> Solution A
> Iodine (form not stated, presumably crystals) 2.0 grams
> Methyl alcohol 46.0 ml
> Shake until dissolved.
>
> Solution B
> Thiocarbamide 4.0 grams
> Waer to make 46.0 ml
>
> For use take equal parts of A and B. The combination may be
> diluted with water to slow the action. Apply with a soft
> brush and immediately swab with methyl alcohol on a tuft of
> cotton. Blot off alcohol and repeat until the desired amount
> of reduction is obtained. Fix in hypo and wash.
> It is also recommended that the Iodine-Thiocarbamide
> reducer can be diluted with methyl alcohol for local
> reduction of dry prints.
>
> Source: _Photographic Facts and Formulas_ 1940 edition.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
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