OK, take 2 without sulphuric acid. Load paper and expose as normal. Develop as normal (with the developer I use, about 60s) - so far, normal Pinsta use, now everything changes. Acid Stop - 30s (1:19 - normal film stop bath) Rinse - 60s Bleach - 120s ( 1:1 0.4%KMn03 : 5.4%NaHSO ) Clear - 60s (5% Na2SO3) Rinse - 60s Redevelop in toner/fogging dev- 120s (Iron Out 20g/250ml or see https://www.aastudiosinc.com/post/2018/03/11/an-intro-guide-to-process-consumables-formulas-set-up-for-analog-photobooths ) Rinse - 60s Total time: 9:30, round to 12 minutes for solution introduction/removal. Rinse times could be reduced.

Fixed the stop bath - thanks. Now to decide if I want to buy a bottle of sulfuric acid...

OK, so the summary process is as follows: Load paper and expose as normal. Develop as normal (with the developer I use, about 60s) - so far, normal Pinsta use, now everything changes. Acid Stop - 30s (1:19 - normal film stop bath) Rinse - 60s Bleach - 120s ( 1:1 0.4%KMn03 : 2%H2SO4) Clear - 60s (5% Na2SO3) Rinse - 60s Redevelop in toner/fogging dev- 120s (Iron Out 20g/250ml or see https://www.aastudiosinc.com/post/2018/03/11/an-intro-guide-to-process-consumables-formulas-set-up-for-analog-photobooths ) Rinse - 60s Total time: 9:30, round to 12 minutes for solution introduction/removal.

Fair enough - do you mind if I summarise the steps and chemicals for the full in-pinsta process here? Also, do you think this would work with sheet film as well? (Plus you can tell me if I've got something wrong!)

Great article, but I notice that you stop short of running though the full process using the toner/fogging developer. Any reason for that?

I was planning on trying it with some old Multigrade IV.

With the pre-wash, did you extract the water before developing? Other causes of the issues you are seeing are under-development, and pooling. The pre-wash helps wet the paper to minimize pooling, but also remember to agitate gently while loading the developer.

Almost right! It is a pre wash before development, not exposure. The purpose is to wet the surface of the paper to minimize pooling of the developer.

That's awesome to see! What was the film and your exposure time?

Nice work. I really like leading lines drawing the eye into the camera. I also think the way you have the camera almost turning to look at the viewer is genius - it brings so much personality to an inanimate object!

Further to this, I have found that pre soaking the paper before development also helps a lot with the pooling issue. A 60sec wash with plain water before development seems to get rid of the problem completely. The only issue is that you need to add about 15s of development time for each sheet you have already processed to compensate for the dilution.

Further to this, I have found that pre soaking the paper before development also helps a lot with the pooling issue. A 60sec wash with plain water before development seems to get rid of the problem completely. The only issue is that you need to add about 15s of development time for each sheet you have already processed to compensate for the dilution.

That must be it! And it is so obvious in hindsight! Thanks!

For each halving of ISO, double the exposure time, and for each doubling of f stop, double the exposure time. So for ISO 3 paper, and f/256, multiply by 64.

Has anyone else had problems with uneven development? I keep getting a region of greater development, the there is a puddle of developer. I have tried increasing the development time, but that just results in a very dark result, and still has an even darker region. I am using Ilford MG-IV and developing in Ilford Warmtone for 60s followed by fixing with Ilford rapid fix.