Uploaded November 2020 | Updated September 2026, 1 hour ago

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After months of not making progress on a project I'd started early 2020, I found some inspiration to chip away at the RA-4 reversal process. You can see more about my start in this process here:

youtu.be/M34136M-8NU

RA-4 is the name of a color process intended for taking color negative films and printing them in the darkroom as a color positive. With some heavy filtration, a bit of patience, and heaps of light, we can actually expose this paper directly in-camera and specialty process this paper as a color positive!

Be sure to check out Joe Van Cleave and Ethan Moses' videos on RA-4 Reversal here:

youtube.com/watch?v=BkcIk8M4KVc

youtube.com/watch?v=ry6ycSgT8g8

Higher res scans of my RA-4 portraits here:

flickr.com/photos/mat4226/albums/72157715483193151

Questions? Send me an email: largeformatquestions@gmail.com

Support the Channel here: paypal.com/paypalme/matm/5

Content by Mat Marrash: matmarrash.com

#largeformat #filmphotography

00:00 Intro
01:27 Process Recap
04:40 Color Filtration
07:58 Portrait Tests
10:55 Darkroom Prep
12:16 Color Development
15:23 Blix & Color Notes
16:40 8x20 Time!