[pure-silver] Re: ID-11 and D-76
- From: "Jason McPeak" <mcpeak.jason@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Thu, 24 Apr 2008 18:15:46 -0500
Yes, ID-11 and D-76 really are the same, as are NACCO Super 76 concentrate.
I usually use ID-11 or Nacco super 76, I try to use Nacco because like
ILFOTEC-HC it's a highly concentrated liquid, that you make a stock solution
from, so A bottle goes along way.
On 4/24/08, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
>
> ----- Original Message ----- From: "Shannon Stoney" <
> shannonstoney@xxxxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Thursday, April 24, 2008 8:20 AM
> Subject: [pure-silver] ID-11 and D-76
>
>
>
>> I have always heard that ID-11 and D-76 are the same formula. But Ilford
>> does not seem to think so. I was looking at the film boxes for HP5+ and
>> FP4+, and the boxes say to develop both films for 11 minutes in D-76 1:1.
>> But with ID-11, you develop HP5+ for 13 minutes and FP4+ for 11 minutes. I
>> thought it might be a misprint so I went to the website, and it said the
>> same thing.
>>
>> Weird, huh.
>>
>> --sghannon
>>
>> The _published_ formulas are the same but the _packaged_ developers are
> somewhat different. Kodak uses the buffered version of D-76 which has been
> published as D-76d. This is more stable in activity than the original
> formula. Probably both contain sequestering agents, etc. The activity may
> not be exactly alike.
> However, I think the cause of the different times has to do with
> differences in the sensitometry. Ilford's measurements may be later than
> Kodak's or there may be other small differences in testing. I think they
> also specify different agitation techniques although that should not make a
> significant difference.
> Ilford also uses a different contrast index target. Kodak charts are for a
> contrast suitable to contact printing and diffusion enlarging. Ilford uses a
> compromise contrast index midway between diffusion and condenser values.
> However, that should result in slightly shorter development time, not
> longer.
> In fact, the only way to check if the times are correct is to test them. I
> think I would trust Ilford on this one.
>
> ---
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
>
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--
I am a leaf on the wind! Watch how I soar.
-Hoban "Wash" Washburn
(serenity movie)
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