[pure-silver] Re: Kodak D76 Developer
- From: "Brian Smith" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "smithcbrian2" for DMARC)
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 23 Mar 2021 01:01:45 +0000 (UTC)
The reason why it is a bad idea not to make up the full amount is that, as the
contents of the packet are mostly sulphite (maybe 100g per litre) and the
quantity of developing agents is very small (just a few grams per litre),
there's no way of ensuring that any part-packet amount will contain the correct
proportions of the developing agents.
I make up print develop a US gallon at a time and store it in small brown
bottles filled to overflowing. I've never had it go off.
Brian
On Tuesday, 23 March 2021, 01:41:34 pm NZDT, Tim Daneliuk
<dmarc-noreply@xxxxxxxxxxxxx> wrote:
On 3/22/21 4:33 PM, Louis Smit (Redacted sender lsmit for DMARC) wrote:
Hello Everybody,
I have a question about D76. Can I divide the content into smaller amounts so
that I can mix smaller volumes at a time? I do not use a full batch until
after the 12 month shelf life is over and wonder if it is possible to mix
smaller batches. Some opinions out there seem to indicate that it is not
advisable as the powder my not be uniformly mixed. Is that a concern?
Thank you,
Louis Smit
Coquitlam BC, Canada.
As others have mentioned, this is a bad idea. However, making the full
gallon and then pouring off into brown glass bottles with polycone caps
is a perfectly reasonable thing to do. Never store developer in plastic.
Most plastics are permeable to air and will not prevent oxidation.
That said, if you're really using such low volumes (or even if you are not),
consider moving to a one-shot developer that you mix, use and throw away.
HC-110 Dilution B will give you similar results to D-76. The stock solution
you buy from Kodak lasts forever. Even the working solution can actually be
stored for a few weeks (again, in a brown glass bottle).
As I recall, 1/2 gal of HC-110B is good for something like 6 8x10 equivalents
(1 roll 35 or 120, 4 - 4x5s, or 2 - 5x7s) and will easily keep in a
bottle for a month or so. Quite inexpensive.
Another good choices for one-shot might be Rodinal.
An even cheaper alternative is Pyrocat-HD which you can mix yourself or
buy from Photographer's Formulary, though you need to be more careful
with handling, skin protection, eye protection, etc. with Pyrocat.
Finally, if you really want to stick with D-76, you can mix your own in
smaller quantities.
https://lostlightphotography.com/kodak-d76-formula/
Chemicals are easily obtained from Artcraft but this does incur heating
the distilled water, weighing and mixing everything yourself.
Again, anytime you mix your own chemistry you need:
- Skin protection
- Eye protection
- A good face mask
- Ventilation
- Some kind of labcoat to protect your clothing
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