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  #11  
Old 8th April 2014, 09:09 PM
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OK, did some searching and Obsidian Aqua is a compeletly different beast to D76. For starters its a staining developer.
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  #12  
Old 9th April 2014, 12:02 AM
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Quote:
Originally Posted by cliveh View Post
In what way is ID11 superior to D76?
It isn't Clive. It's the same developer. D76 is Kodak's name for it, ID11 is ILFORD's name for it.

richard

Last edited by richardw; 9th April 2014 at 12:09 AM.
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  #13  
Old 9th April 2014, 12:08 AM
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Quote:
Originally Posted by Argentum View Post
Is Obsidian aqua a staining developer ?
Do you have the corresponding 510-Pyro chemicals/mixing instructions. ( I think I have them somewhere but can't locate them right now)
Yes OBSIDIAN AQUA is a staining developer.

I mix 510-PYRO as per Jay DeFehr's instructions.

See attached pdf

richard
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File Type: pdf Mixing 510-PYRO.pdf (195.8 KB, 332 views)
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  #14  
Old 9th April 2014, 01:22 AM
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Quote:
Originally Posted by richardw View Post
Yes OBSIDIAN AQUA is a staining developer.

I mix 510-PYRO as per Jay DeFehr's instructions.

See attached pdf

richard
Thanks muchly
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  #15  
Old 9th April 2014, 01:56 AM
Stocky Stocky is offline
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Quote:
Originally Posted by richardw View Post
Yes OBSIDIAN AQUA is a staining developer.

I mix 510-PYRO as per Jay DeFehr's instructions.

See attached pdf

richard
I mixed up some 510-Pyro and found it to deliver rather low film speed (1 stop slower than any other developer I had ever tried).
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  #16  
Old 9th April 2014, 07:44 AM
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Quote:
Originally Posted by richardw View Post
It isn't Clive. It's the same developer. D76 is Kodak's name for it, ID11 is ILFORD's name for it.

richard
I think there are some very subtle differences in the chemical makeup these days but yes they are essentially the same except the D76 seems to be a lot cheaper.
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  #17  
Old 10th April 2014, 10:50 PM
DaveP DaveP is offline
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I seem to remember reading there is some minor difference between ID11 and D76, evident because one comes in a single packet and the other comes in two parts. One of these days I need to get round to using either. Anyone know if there's any marked difference between the results from them compared to DDX?
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  #18  
Old 10th April 2014, 11:18 PM
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Personally I think DDX is best suited to very fine grain films where you want to add a tad of subtle grain. With old style filmS DDX is a tad too grainy for me. Best suited to T-Grain films.
DDX will give full film speed + maybe a third stop.

D76 doesn't give that little xtra speed and I'd say a tad less grain.
Also D76 doesn't get off the toe so quick as DDX.

But as usual YMMV and you should test yourself.
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  #19  
Old 11th April 2014, 09:12 AM
Alan Clark Alan Clark is offline
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Quote:
Originally Posted by DaveP View Post
I seem to remember reading there is some minor difference between ID11 and D76, evident because one comes in a single packet and the other comes in two parts. One of these days I need to get round to using either. Anyone know if there's any marked difference between the results from them compared to DDX?
Dave Butcher, who was head chemist at Ilford, once said in a lecture that DDX was "liquid ID11". he said he used it in preference to ID11 because, as a chemist, he couldn't be fussed with actually mixing chemicals. I think this was a joke. Well, someone on the front row laughed. Probably another chemist. (Anyone who has mixed a batch of ID11 knows that it is actually about as difficult as putting a spoonful of sugar in your coffee and stirring it until it has dissolved...)
Thinking that an Ilford chemist would surely know which was their best developer, I bought an expensive bottle of DDX only to discover what Argentum has said, above, i.e. it gives quite grainy results.. So it turns out that it is actually quite different to ID11 (and D76). So much for Ilford chemists!
To be fair to Mr. Butcher, he was using it with 120 FP4, and I used it with 35mm Tri X.... I didn't buy any more.

Alan
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  #20  
Old 11th April 2014, 09:21 AM
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I think DDX was developed (sic) because the delta t-grain films require an extra kick to lift the toe up. Without that kick you can lose maybe a stop of film speed if you are looking to achieve good shadow separation. So with a t-grain film using ID11/D76 you won't get nearly as much film speed as you would with DDX but at the cost of some extra grain.
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