Film Negative Processing
Signal chat: https://signal.group/#CjQKIHHhnsQAZbMd9t4TxumxNguOwY8Pckc5wvTLpSRjiPekEhBBZxKZvAOHUEsqgp912fH6
Negative Processing Chemistry Research & Recipes
Some links to lower-toxicity recipes for dev/stop/fix, with some price and source exploration:
Chems
Sodium thiosulfate (pentahydrate/crystalline) - [FIX]
400g - $37 - etsy - $0.0925/g
113g - $7 - ebay - 113g – $0.0619/g
2500g - $50 - ebay - $0.0200/g
1360g - $55 - ebay - $0.0404/g
1360g - $50 - ebay - $0.0368/g
450g - $15 - ebay - $0.0333/g
Sodium sulfite (anhydrous) - [FIX]
30g - $40 - ebay - $1.33/g
500g - $150 - ebay - $0.30/g
500g - $50 - ebay - $0.10/g
450g - $30 - ebay - $0.07/g
450g - $23 - ebay - $0.05/g
225g - $16 - ebay - $0.07/g
450g - $14 - ebay - $0.03/g
100g - $10 - ebay - $0.10/g
Ascorbic Acid [DEV]
225g - $13 - ebay - $0.057/g
1000g - $40 - ebay - $0.040/g
500g - $23 - ebay - $0.046/g
450g - $35 - ebay - $0.077/g
225g - $17 - ebay - $0.075/g
450g - $20 - ebay - $0.044/g
900g - $30 - ebay - $0.033/g
Sodium Carbonate [DEV]
500g - $40 - ebay - $0.080/g
680g - $37 - ebay - $0.054/g
1000g - $30 - ebay - $0.030/g
100g - $5 - ebay - $0.050/g
500g - $12 - ebay - $0.024/g
Developer
Caffinol
https://petapixel.com/caffenol-developing-film-with-coffee/
Possibly with espresso given that we have coffee roasting and an espresso machine?
Stop
Fixer
Kodak F-24 based recipe
- Sodium thiosulfate (pentahydrate/crystalline): 240g
- Sodium sulfite (anhydrous): 15g
- preservative, keeps the bath from oxidizing/degrading between uses
- Water (warm, ~40°C to help dissolution) to make 1L total
Equipment
- Changing bag
- Measuring stuff
- 1x 250ml graduated cylinder
- scale
- PPE
- Apron from basement
- Goggles
- Nitrile gloves from basement
- Tanks
- 3x 2-reel 35mm steel
- 3x 1-reeel 35mm steel
- Reels
- ?x 35mm steel
- 2x 16mm steel
- 120/220
- Thermometer
Negative Drying Cabinet
(Can be used for drying other stuff too, esp. if further modified)
Initial Build
Started by finding a wooden cabinet on the street.
Removed a bunch of weird stuff attached too it, painted with coat of oil-based white paint.
Attached a tiny set of casters.
Tacked a strip of thin hook velcro to cabinet lip.
Glued wide soft velcro to vinyl sheet.
Taped to a metal tube to wrap/roll up front door.
Added wooden cross-supports to help keep vinyl from "collapsing" as much when opening/closing.
Attached printed hooks to hold ends of metal roll-tube.
Trimmed down some found tent-poles to interior cabinet width
Attached printed "comb" to hold cross-bars.
Currently
It's *ok*
- Not the greatest seal
- Not the easiest to open/close
