[pure-silver] Re: D-76 and variations
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 28 Nov 2005 19:50:42 +0100
That explains it. I fill my stock solution into one-shot-size olive glasses
filled to the rim, allowing only room for a tiny air bubble, and I have seen
no increase of developer activity in ID-11 over months.
Regards
Ralph W. Lambrecht
http://www.darkroomagic.com
On 2005-11-28 19:39, "Koch, Gerald" <gkoch02@xxxxxxxxxx> wrote:
> Yes. One often sees the statement that the borax hydrolyses. This is
> false as borax is a stable compund used to make pH standards.
>
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx
> [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of DarkroomMagic
> Sent: Monday, November 28, 2005 1:31 PM
> To: PureSilverNew
> Subject: [pure-silver] Re: D-76 and variations
>
>
> Gerald
>
> Is that why I see no rise in activity in ID-11 if I seal it from air
> completely?
>
>
>
>
>
> Regards
>
>
>
> Ralph W. Lambrecht
>
> http://www.darkroomagic.com
>
>
>
>
>
>
>
> On 2005-11-28 19:04, "Koch, Gerald" <gkoch02@xxxxxxxxxx> wrote:
>
>> The problem with the rise in pH of D-76 with time is due to the
>> oxidation of hydroquinone. This is a fairly complex reaction in which
>> OH- ions are produced. It has nothing to due with either carbonates
>> or borax.
>>
>> -----Original Message-----
>> From: pure-silver-bounce@xxxxxxxxxxxxx
>> [mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of John Black
>> Sent: Monday, November 28, 2005 12:51 PM
>> To: pure-silver@xxxxxxxxxxxxx
>> Subject: [pure-silver] Re: D-76 and variations
>>
>>
>>
>>>
>>>
>>> The original D-76 formula and Ilford's published formula for ID-11
>>> are:
>>>
>>> Water (at 125F or 52C) 750.0 ml
>>> Metol 2.0 grams
>>> Sodium Sulfite, dessicated 100.0 grams
>>> Hydroquinone 5.0 grams
>>> Borax, granulated 2.0 grams
>>> Water to make 1.0 liter
>>>
>>
>> Seems like I remember the OLD original prewar formula for D76 was
>> accelerated with Na Carbonate and had a problem with increasing
>> activity with aging in solution that was traced to a rise in pH
>> mediated by the carbonate. All of which was remedied by switching to
>> borate accelerators/buffers. Am I dreaming or was that the case many
>> years ago?
>>
>> JB
>>
>>
>>
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