Correct, don't use this fixer. Colloidal silver will eventually attack the image silver.if it's colloidal sulfur no filter will do...
My 5L jug of Fomafix purchased last November, LOT 0708, exp. date 2021-30-09, half full right now, still looks OK.
It's strange that neutral fixers for fixing B&W material were never produced by a major mfg . Tetenal being the only exception with their Superfix geruchlos / odourless fix.
There are some offbrand products available in Europe, e.g. from Amaloco and Rollei. The magic word to search for is "odorless", not "neutral". You can also use any fixer recommended for color processes, sometimes there are very cheap specials on minilab fixer.It's strange that neutral fixers for fixing B&W material were never produced by a major mfg . Tetenal being the only exception with their Superfix geruchlos / odourless fix.
That may have been the reason. Bill Troop got massive flak for his alkaline fixers back then, I guess this did not exactly encourage larger manufacturers to explore this market. According to Bill Troop several automatic black&white processors secretly used alkaline fixers.Bear in mind that using neutral fixer is paramount to use also an acidic stop bath before.
No water rinses.
Bear in mind that using neutral fixer is paramount to use also an acidic stop bath before.
No water rinses.
That may have been the reason. Bill Troop got massive flak for his alkaline fixers back then, I guess this did not exactly encourage larger manufacturers to explore this market. According to Bill Troop several automatic black&white processors secretly used alkaline fixers.
The main reason were fast wash times. Long shelf life was no concern back then. Kodak eventually found, that neutral fixers have the same advantages re: wash time and shelf life, and they don't bring about this ammonia smell of alkaline rapid fixers. So neutral fixers it was. We must not forget, that Kodak's B&W research was not exactly hyperactive during the last 40 years, except for XTol there were no new Kodak B&W chemistry products introduced to the market.You know more about fixers than me (I am about to try your posted recipe this weekend), but I had understood that long term shelf life was the main reason.
Agfa made Agfa FX Universal which was slightly alkaline. It's NLA for a long time now though.
I don't see a pH of 7 thereIn Australia, Agfa had quite a high presence, and the back label for FX-Universal (pH>7.0) showed dilutions for black and white.
I don't see a pH of 7 there
do you have an msds?Nobody said it was 7. He said ">7.0" which is "greater than 7.0" and I said "slightly alkaline". Agfa themselves called it "neutral". It was basically C-41 fixer with dilutions provided for B&W.
do you have an msds?
Let's put it clear: Tetenal odourless fixer is... odourless, not neutral nor alkaline!
On the contrary, the fixer https://www.fotoimpex.com/shop/images/products/media/6430_1_MSDS_DE.pdf is slightly acidic, having a pH of about 6,5.
That pH isn't sufficient to stop development if one uses a water wash after the developer. There's also a risk of dichroic fog.
Whilst a common fixer has much lower a pH that is sufficient to halt development even if a stop bath isn't used.
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