[pure-silver] Re: D-76 and variations

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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