Uploaded December 2021 | Updated September 2026, 4 hours ago

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Color darkroom paper, aka RA-4 paper isn't just great at printing from negatives. It can also be used to make in-camera direct positives using a color reversal process. I've been chipping away at this process for a little over two years and am here to share my latest updates with the channel.

Festivus RA-4 Portraits Dec. 10th - 12th: marrash.com/new-events
Use code "LFF10" to save $10 on a booking!

Stephen Takacs - stephentakacs.com

Brownie in Motion on IG - instagram.com/brownieinmotion

New Prints! - marrash.com/prints

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Become an LFF Sustaining Member HERE: marrash.com/memberships

Support the Channel here: marrash.com/donate

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

Content by Mat Marrash: matmarrash.com


#largeformat #filmphotography #darkroom

00:00 Intro
01:23 RA-4 Supplies
04:16 Processing Steps
06:30 Testing & Light
07:39 Filtration
10:30 What ISO?
13:04 Scaling Up
16:02 Brownie in Motion
17:34 Festivus Portraits
19:04 Kallitypes