RA4 Printing with a Paterson Orbital

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Dave Son

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Mar 30, 2020
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Afternoon all,

I'm currently trying to learn darkroom colour printing at home and have an issue I could really use some advice on.

Earlier in the summer, I bought two of Tetenal's Magic Box RA4 starter kits and hoped to process colour prints in a Paterson Orbital that I'd picked up on ebay. I had pretty unsuccessful results with the first of the two kits but I'm keen to give the process another bash and just want to figure out where I went wrong before I mix up the second batch.

The kit states that it is capable of producing 18-25 sheets of 8x10 paper before the chemicals are exhausted but this was not my experience at all. During the first evening of using the kit - I processed a handful of test strips and three whole 8x10 sheets before landing on a print I was happy with. The following evening I tried to re-use the chemicals and found that every piece of paper came out of the Orbital with brown/yellow stains randomly placed on the prints, which couldn't be washed off.

I'll summarise the way I processed the paper in the Orbital in the following (as per the kit's instructions):

- Everything was processed at 30°C
- Prewash - 60 seconds
- Developer - 100 seconds
- Stop - 15 seconds
- Blix - 100 seconds
- Wash - 30 seconds x 8
- Stabiliser - 60 seconds

I rinsed the tank in between these steps to try to avoid cross contamination between the chemicals and thoroughly washed and dried the Orbital before loading more paper into it.

I was using Fuji Crystal Archive paper.

Tetenal suggest that these chemicals can be re-used but I'm wondering if re-using them was what caused this issue? If used one shot, this batch would be over very quickly but perhaps that's what I should have done? Does anyone have any advice on colour printing with an Orbital? Is it best to always do things one-shot with this type of processor?

Any advice on this would be greatly appreciated.

Many thanks,

Dave
 

koraks

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Sounds like you still had some blix contamination. I'm not sure how well the orbital can be rinsed, or perhaps there are other places in your process where cross contam might have occurred.
 
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Dave Son

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Mar 30, 2020
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thumbnail_image0.jpg
thumbnail_image1.jpg
 
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Dave Son

Member
Joined
Mar 30, 2020
Messages
9
Location
Scotland
Format
Medium Format
They're definitely not light leaks - the paper was loaded in complete darkness and the Orbital is light tight; I know this because there are no such marks on from the first printing session.
 

AgX

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Which means to check whether the lid may appear to be well seated, but instead is not. Or to check whether the sealing labyrinth is still okay. It may have bee damage at different places what only in a certain orientatio might lead to leak.
Well, never had one in my hands, even completely forgot about it. Thus these are just some first instance thoughts.
 
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