Gum Bichromate Process

[@filibertkraxner305]

Wow, Bob. Thanks so much for showing us all of the important details that go into making a gum bichromate duotone print. What a lovely process. I need to figure out some darkroom logistics but I'm definitely giving this a try for my portraits!

[@NickVenture1]

Thank you for the upload and explaining the process.For mixing the liquids you should buy a magnetic mixer.

[@ekimusman2]

thanks so much for this tutorial, Bob. i'm a printmaker, and you've convinced me to dive into photographics in my space. i used to think that i needed a 100% dark room.

[@TheStockwell]

I'm looking forward to attempting gum bichromate prints this summer. Your channel is a great source of knuckles and know-how techniques. It's appreciated! 😸

[@spacedarkstar]

Thank you for this great video of yours , very interesting and I learn things, so thank you for your work done here, the teaching and informative work.

[@silekiernanphotography]

Thank you for taking the time to do this Bob.

[@victor.marchenko]

so generous and thorough exlanation, thanx!

[@Julius_S]

Thank you so much for these wonderful videos!!! Watched this numerous times over the past year and FINALLY started gum printing, and now am back to see all the wonderful tidbits that were tough to comprehend before actually trying the process. You're amazing!!!

[@Julius_S]

@Bob Carnie Absolutely!!! I could and have been frequently printing all day for days at a time and I'm just in love with these processes. Thank you for all of the experience you share!

[@fabioesteban9072]

Thank you so much. This was great to see before I get started on my journey. Fe

[@martyzielinski1442]

I wonder if you can print color separation negatives with three different color dyes????? COLOR!

[@felipejacome2405]

Hi Bob. You mentioned that you make silver gelatin negatives. I´m wondering how you coat it so smoothly in a such a large acetate. I´m asking because I do the same but I lay down the silver gelatin on duralar with a brush and it leaves brush marks. Thanks!!

[@theIntuitionist]

Thank you for putting this information out there!

[@NitramYewolas]

Excellent, thanks for taking the time to make the video and share your knowledge.

[@headspacespacebar]

Amazing work 🙏 any idea why my prints drive super curved? I did a preshink but I didn't size the paper.

[@douggottlieb]

A masterclasss. Thank you for sharing!

[@fotolookconde]

Great video, thanks! This motivates me to carry on with alternative processes and uploading videos on my KZbin channel dedicated to film photography!

[@stefanopassiglia]

Great tutorial! Made me think that bichromate is not an impossible process as many led me to believe! By the way - that's not Radiohead, it's Muse lead singer, Matt Bellamy.

[@ammartaibi8011]

Thank you for the information. And a magnetic stirrer will help you a lot. They're fairly cheap

[@ammartaibi8011]

@Bob Carnie you put your chemicals in an Erlenmeyer flask with a magnetic rod and put it on the stirrer. You can control the speed and temperature (cheap ones just stir with no heating). We used them all the time when i was doing my chemistry major

[@ammartaibi8011]

@Bob Carnie can you guide me to some books or forums, videos.... That talk about the process in more detail specially how to get the exposure right?

[@ammartaibi8011]

@Bob Carnie www.amazon.com/INTLLAB-Magnetic-Stainless-Stirring-Capacity/dp/B088SGT4LZ?ref_=d6k_applink_bb_marketplace Amazon link to the first one I could find

[@LScott97]

Fantastic information! Thank you!👍👍👍

[@marknelson7451]

Nicely Done Bob!

[@IainHC1]

Thanks Bob. Really enjoyed watching this process.

[@alfvq]

I didn't get if you use a different separation for each layer or you only use the same negative with different concentration/exposure

[@node547]

Thank you. I will explore this further.

[@MoisheLettvin]

This is great info -- thank you! Looking forward to trying this out.

[@steeptakeoff]

Bravo - Love your work!

[@kinunshele]

Nice one Bob thank you, great video

[@barbatron100]

are you not worried about the dichromate on your hands while developing and coating?

[@lichtmaler]

super interesting. Whats the name of the punch system?

[@lichtmaler]

@Bob Carnie Thanks Bob! Appreciate it!

[@prakrutimaitri4345]

Thank you so much for this video! I've realised so many ways I might be going wrong with the process. Just wondering what the exposure duration is in minutes? (For the proportions you have mentioned) and is it necessary to have a light box with UV lights or is a more basic light box sufficient?

[@davidhoptman2379]

Very Informative_Thank You

[@aimeedanger]

You said you pre-sized the paper. What's your preferred sizing technique? I'm encountering problems clearing the pigment and I think it's my sizing.

[@Serenitees]

Great video! Can you comment on how you prepare your pigments? Thanks!

[@Serenitees]

Thanks! The Bowie portrait is epic and I LOVE the concept of light painting with the water!

[@rmgoldfarb6475]

Thank you so much for all these tips and tricks with the process! I love it but have been struggling with getting the results I wanted , as I’m doing it from scratch on my own. This has been a great confidence boost and I feel ready to work on it again :)

[@mollypix]

I'm very interested in how you make your negatives, can you give any information Thanks very much

[@rmgoldfarb6475]

@Bob Carnie how would you calculate the right negative without the quad tone programme?

[@brendankeane5725]

How does one ensure the print dries flatly?

[@brendankeane5725]

@Bob Carnie Thanks Bob. Great video. You're a master of the craft. Learned loads.

[@shajinjaleelartist]

thank u sir.....

[@krishartsphotography5643]

Thank you Sir. Nice & informative video :)

[@kinarast]

Yeah, I'm studying but sidetracked too many times lol

[@JeffCowan]

This is gold.

[@kinarast]

That is so cool. The more modern technologies are also cool but it's too complicated to understand lol

[@julietaschab9296]

Bob shouldn't you be wearing gloves? 😢