[pure-silver] Re: New Dektol, dark brown
- From: "titrisol" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "titrisol" for DMARC)
- To: "pure-silver@xxxxxxxxxxxxx" <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 31 Mar 2021 16:32:12 +0000 (UTC)
hypo = Sodium thiosulfateIt used to be called Hyposulfite of Soda
On Wednesday, March 31, 2021, 12:27:22 PM EDT, Janet Gable Cull
<janetgcull@xxxxxxxxx> wrote:
How do you make hypo?
Janet Gable CullSent from my iPhone
On Mar 31, 2021, at 8:21 AM, Claudio Bonavolta <claudio@xxxxxxxxxxxx> wrote:
Yes, fixer formulas are not critical and closer to cooking recipes than rocket
science, so it's pretty easy to play with.
Some, like plain hypo, are very basic ...
I forgot to mention the main reason I switched to neutral-alkaline fixers: my
lungs are pretty sensitive to sulphur dioxide and removing the acid drastically
reduces the release of that nasty gas.
Regards,
Claudio Bonavolta
www.bonavolta.ch
31 mars 2021 07:06 `Richard Knoppow <dickburk@xxxxxxxxxxxxx> a écrit:
I just posted some variations on Kodak fixers. This is like a
combination of F-7, rapid fixer and F-24, a non hardening
thiosulfate fixer. I have no doubt it works. F-24 has more
bisulfite in it so is more acid but not as acid as a hardening
bath would be.
On 3/30/2021 1:11 AM, Claudio Bonavolta wrote:
I too use a formula with sodium thiosulfate +
ammonium-something. I suspect our formulas must be very similar
(derived from Kodak's F-7/F-9) ...
It has the following advantages:
- neutral pH (following wash is easier)
- fast fixer (similar to ammonium thiosulfate fixers)
- uses only powders so shipment and shelf-life of raw chemicals
is not problematic
As it's a neutral fixer, I include a brief wash after the stop
bath.
Chemical Quantity Comments
Water 600ml
Sodium Thiosulfate 360gr crystalline or 230gr
anhydrous
Ammonium Chloride 50gr or 60gr ammonium sulfate
Sodium Sulfite 15gr anhydrous
Sodium metabisulfite 5gr
Cold water to make 1000ml pH around 7.0
Other chemicals are quick wins:
Stop bath -> citric acid @ 15gr/l
Washaid -> sodium sulfite @ 20gr/l (to be dumped at the end of
the session)
But paper developers are not difficult either ...
A short page with some links to resources:
https://www.bonavolta.ch/hobby/en/photo/fo_chem.htm
Regards,
Claudio Bonavolta
www.bonavolta.ch
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Other related posts:
- » [pure-silver] New Dektol, dark brown- Janet Gable Cull
- » [pure-silver] Re: New Dektol, dark brown- Ken Hough
- » [pure-silver] Re: New Dektol, dark brown- John Stockdale
- » [pure-silver] Re: New Dektol, dark brown- `Richard Knoppow
- » [pure-silver] Re: New Dektol, dark brown- `Richard Knoppow
- » [pure-silver] Re: New Dektol, dark brown- `Richard Knoppow
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- » [pure-silver] Re: New Dektol, dark brown- Janet Gable Cull
- » [pure-silver] Re: New Dektol, dark brown- BOB KISS
- » [pure-silver] Re: New Dektol, dark brown- abarton50
- » [pure-silver] Re: New Dektol, dark brown- Ken Hough
- » [pure-silver] Re: New Dektol, dark brown- `Richard Knoppow
- » [pure-silver] Re: New Dektol, dark brown- Janet Gable Cull
- » [pure-silver] Re: New Dektol, dark brown- Laurence Cuffe
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- » [pure-silver] Re: New Dektol, dark brown- Kimberly Schneider
- » [pure-silver] Re: New Dektol, dark brown- Chauncey Walden