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  1. #1

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    fog on colour paper

    What colour have fog on colour RA4 paper ? I develop white sheet of paper in RA4 fresh developer and after developing paper looks that. For what do this attached. At first I think my developer is dead and I do fresh developer from fresh concentrate but problem don't go away

  2. #2
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    It could be several problems. I see uneven development to start with. I see what might be safelight fog, over development or expired paper. Any of these can do what I see here except the uneven development. That causes the swirly pattern.

    PE

  3. #3

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    I develop in Cibachrome drum at 35 C dev time 1 min. Developer is fresh maybe over development ? Paper is also fresh (1 month) but I cut 30.5 cm x 88 m roll for 30.5 x 45 cm sheets and put paper in to black bug, maybe it is reason ? But I did it before which my first roll and don't have that problem

  4. #4
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    Did you prewet and use a stop bath? Lack of a stop bath can cause chemical fog during blixing and also it can cause what appears to be light fog.

    But, it could be safelight fog.

    PE

  5. #5

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    Better tell us what you do exactly including what safelights you use. Leave nothing out in your description. This sounds like a lot of work but it will help get us to a solution quicker than us stating possible causes then you telling us bit by bit what you do when developing.

    pentaxuser

  6. #6

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    I work in completely dark. Only when i put paper the drum I turn light on and develop paper, but drum construction allow develop in normal light

  7. #7
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    In that case, please consider my other suggestions.

    PE

  8. #8

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    I work in completaly dark, until I put paper into the drum I use acetic 2 % stop bath and I use alternative blix, blix works good but maybe It's dead& I develop in that blix app 1.5 roll of paper in 10 litres& Maybe it is a reason

  9. #9

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    I develop 1 sheet of paper only in blix and paper become white maybe Blix fix but not bleach and when I develop fix function works but bleach funktion not ?

  10. #10

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    Strange, I always reuse and replenish blix even more than the developer and get no streaks or fog, even with long expired Kodak Supra III paper and cheapest white vinegar as a stop bath. Could it be the choice of chemicals? Tetenal's pro 3-part dev and 2-part blix - made in Germany - is the only economical RA-4 option for darkroom work over here (Croatia) and they work fantastic. Do you agitate and roll the drum well? Is the black bag totally opaque?

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