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  #1  
Old 18th December 2021, 09:14 PM
Nat Polton Nat Polton is offline
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Default ID62 Concentrate Shelf Life.

I have made up several batches of ID62 Developer and only used it for prints.
The formula can be found in the Ilford Manual of Photography.
I cannot remember how I latched onto it, but I am happy with the results.

So far I have used up the concentrate fairly quickly.
I was pondering making a largish batch of concentrate, but have no idea of the shelf life.

Does anybody have any experience or knowledge about ID62 concentrate shelf life?

Cheers.
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  #2  
Old 19th December 2021, 09:45 AM
Lostlabours Lostlabours is offline
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I use ID-78 which is essentially just a slight variation of ID-62 and it lasts well over a year. ID-78 is the warm tone developer essentially it has no Benzotriazole and increased Potassium Bromide.

When you say concentrate do you mean the published formula ? I mix to commercial strength by using Potassium rather than Sodium Carbonate and a small amount of Sodium Hydroxide. This substitution is used by Ilforsd, I found it in one of their Patents a few years ago, it's more convenient as it's 1+9 dilutiom and also keeps better.

Ian
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  #3  
Old 19th December 2021, 01:15 PM
Terry S Terry S is offline
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The concentrated formula can be found here:

http://www.lostlabours.co.uk/photogr...rs/devID62.htm

But I'm a bit confused about some of the figures.

The second (concentrated) version has a conversion rate of the first formula at about x 1.5. There is also a change from Sodium to Potassium Carbonate and the addition of some Sodium Hydroxide . But the dilutions don't follow the x 1.5 rule, making the second formula much weaker when diluted for use. Is there a (chemical?) reason for this?

Terry S
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Old 19th December 2021, 02:05 PM
Lostlabours Lostlabours is offline
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Logic, the published formula is used 1+3 (total 4) the concentrate 1+9 (total 10) 10 divided by 4 is 2.5. So the concentrate has to be 2.5x stronger/more concentrated. However Sodium Carbonate isn't soluble enough and would crystalise out so Ilford, Agfa, Kodak, etc used Potassium Carbonate which has greater solubility and a little Sodium Hydroxide instead. Agfa used more Hydroxide as it's cheaper.

Ian
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Old 19th December 2021, 02:21 PM
Terry S Terry S is offline
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Okay, I'm sure that all makes sense Ian.

I just need to read it a few times to let it soak in...

Terry S
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  #6  
Old 19th December 2021, 03:21 PM
Lostlabours Lostlabours is offline
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Look at it another way Terry.

If you mix the published formula then take 250ml and mix at 1+3 to give 1 litre of working developer that contains 3g of Hydroqinone.

A litre of the stock Concentrated version contains 30g Hydroquinone so mixed 1+9 a litre of working solution again contains 3g Hydroquinone.

Ian
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  #7  
Old 19th December 2021, 03:42 PM
Nat Polton Nat Polton is offline
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Thank you both for your replies.
I have been mixing up the first formula from the Lostlabours site.
That is the one in The Ilford Manual of Photography.
NOT the concentrated commercial strength.

I am still using some that I made in late June 2001.
Almost six months old and I have not noticed any difference. Stored in reasonably full bottles with a squirt of butane.
I think I will try both formulas and also the ID78.

It will be interesting to make up the three and put aside a couple of 100ml bottles of each, so I can see how well they function after six months and a year. Same negative, fixer etc.
At my age it might be tempting fate to try an experiment lasting much longer.
As the actress Maggie Smith said in one of her film roles, "At my age I don't buy green bananas."

Cheers.
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  #8  
Old 19th December 2021, 04:04 PM
Lostlabours Lostlabours is offline
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Quote:
Originally Posted by Nat Polton View Post
I am still using some that I made in late June 2001.
Almost six months old and I have not noticed any difference.
That would be 20 years

ID-78 is very similar to Harman Warmtone and Agfa Neutol WA. it was originally sold as an Ilford powdered developer.

Ian
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  #9  
Old 23rd January 2022, 11:57 AM
Nat Polton Nat Polton is offline
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I mixed up a litre of Concentrated ID-78 Stock Solution last night.

First time making this one.
Usually when I mix developers I wait for the last ingredient to completely dissolve and clear before adding the next.
When I added the hydroquinone it refused to completely mix. Fine undissolved crystals made the solution cloudy.
Warming in a water bath and constant stirring with my magnetic stirrer made no impression after two long hours.
As it was now after midnight I gave in and dumped the Potassium Carbonate in.
The result was instant clearing of the developer. Then in with the Sodium Hydroxide and Potassium Bromide.
At last a result.

I hope this saves anyone else from wasting time like I did.

I have scribbled a reminder on my copy of the formula to remind me for next time.

Cheers.
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