This is a brief article to provide an update on the making of the ClBr (Chloro-Bromide) silver gelatin emulsion for my large format paper negatives.
I am creating the emulsion based on the recipe found in the SPSE Handbook of Photographic Science and Engineering, 1973 edition.
I choose this emulsion because of the light spectrum mostly. Silver bromide (AgBr) has a wider spectrum than silver chloride (AgCl), which covers UV and violet, but the ClBr emulsion also sees into the blues making it a perfect choice for my style and creative vision.
My plan is to develop these paper negatives with D23 that I mix from raw materials. I plan to make Stouffer wedge contact prints to illustrate the tonal range (toe and shoulder) and publish them.
I will first be printing on a known paper before moving to the next step and creating the emulsion for my prints and hand coating that paper. At this time, I will most likely be creating a silver chloride (AgCl) emulsion for my large format contact prints and be developing in Amidol and possibly exploring other options.
I like Amidol with silver chloride papers because I have a great degree of control over the tones (warm to cold blacks) in my prints, just by modifying the chemical formula.
Ingredients List for ClBr Emulsion
- Distilled water
- Photographic grade gelatin
- Sodium Chloride (table salt)
- Potassium Bromide
- Citric Acid
- Silver Nitrate
- Photo-Flo 200
- Glyoxal (optional for hardening) - 40% solution
After I make a few batches, I will write another update and hopefully have a stable master formula that I want to continue to use. More to follow soon!
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