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Old 21st July 2014, 04:01 PM
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Default Ro9 paper developer

I have been gathering a bit of background on RO9/Rodinal and read that it could be used as a print developer. It was mentioned that it was the only developer that could be used for both. I have done a little more digging and have found a couple of people who have used it for printing. But no real info on dilution.

Has anyone here had experience of using it for printing?
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Old 21st July 2014, 04:42 PM
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Default universal developer

Spursinn Geminus is I think the only paper and film (small, medium and large format) developer curently on the market - see http://www.keyphoto.com/shop/shop/chemicals/bwchemicals

Ilford PQ universal is technically a universal developer, but for film it is for large format applications (check the deatasheet on their web site) .

I work for keyphoto who imprt Geminus, and have used it as a film developer: surprisingly good results on film!

Universal deveopers are generall (like zoom lenses!) a compromise, but for a low volume darkroom they are cost efficient.

Dave
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Old 21st July 2014, 06:44 PM
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Can't speak for Rodinal as print Dev, but I've gone the opposite direction and used a print Dev (Ansco 130) for film a few times with good results. For film I found 1+25 had similar times as Rodinal at 1+25 did. For paper I use the 130 at 1+1.

So I'd guess you're looking at a fairly strong concentration to do paper in Rodinal.
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Old 21st July 2014, 08:40 PM
Lostlabours Lostlabours is offline
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Yes Rodinal at higher concentration can be used as a paper developer. Around 1:25 to1:15 would be best.

Dektol/D72 is a film developer now used mostly as a paper dveloper/

Ilford PQ Universal gives very fine grain with 35mm films, but it needs to be fresh to be consistent so unless you're using a lot it's going to be less predictable (as it ages).

I wouldn't touch some products mentioned in this thread as it subversive advertising,

Ian
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Old 22nd July 2014, 07:02 AM
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Thank you for the information.

It just go's to show how things change over time.

I was thinking that maybe a stronger mix would be needed for paper.
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Old 22nd July 2014, 10:54 AM
Mike O'Pray Mike O'Pray is offline
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Just a thought and I haven't worked it out but at 1+15 for paper printing wouldn't Rodinal work out as expensive as or more expensive than normal paper developer.

It is 62.5 ccs for a 1L tray so 8 trays worth from a 500ml bottle. A 5L container of normal paper developer gives 50L so 50 trays worth. You'll need to get 6x 500ml bottles of Rodinal for the same price as 5L of MG or PQ developer

Unless Rodinal is very special as a paper developer it would be a non-starter for me on economics grounds

Mike
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Old 23rd July 2014, 09:18 AM
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That's a good point Mike, it maybe why there is little or no info on the subject.
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Old 23rd July 2014, 10:30 PM
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That's what I would figure too. High concentration combined with larger amount for tray processing will get expensive fast.
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