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Gum Bichromate on 140# Fabriano Artistico Hot Press.
1 layer of Holbein Compose Green No.2. Exposed for 4 minutes, 35 seconds. Developed for around 10 minutes. Original negative 4x5 Fuji Acros 100.
Gum Bichromate Recipe:
- 6mL saturated (around 13%) potassium dichromate
- 6mL gum arabic
- About 1/2in of Holbein pigment
Mix thoroughly and apply to paper with two layers (while still wet so it ends up being a total of 1 layer) using a 1in flat wash brush (larger depending on your surface area).
The three color Gum Bichromate over Cyanotype I made today (featuring the lovely ofbovasso)! I posted the video above to explain some of my trial and errors from today because I thought it’d be too long of a post.. though it may also be too long of a video I’m not sure.
Some things I didn’t include:
- I’m using Pictorico Ultra Premium OHP Transparency Film
- Printing as horizontally flipped negatives on an HP Photosmart Home Printer (I’m using photo paper settings, 360 DPI, maximum DPI in print dialog and maximum ink volume)
- In Photoshop after separating the channels into CMY I changed in the levels dialog box the output levels to 50 on the left and 200 on the right to make it a flatter image
GUM BICHROMATE WITH A 4x5 NEGATIVE. YES.
I’m really proud of myself honestly for figuring this out. I feel like I’m moving up in the alternative process world.
1-1 Potassium Dichromate (13%)/Gum Arabic and Lamp Black watercolor exposed for 3 minutes on to Arches 140lb hot press watercolor paper. Developed for around 20 minutes.
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