The DARKROOM COOKBOOK, Third Edition

270 THE DARKROOM COOKBOOK
The stock solution is to make 1.0 liter of concentrate.
FILM: Dilute 1:3. If hardening is desired add 25.0 ml of the hardener to each liter of working
solution. The hardener should be added slowly with stirring. Films should be fully fi xed in
approximately 5 minutes.
PAPER: Dilute 1:7. Prints will be fi xed in 3 minutes. Do not leave prints in this fi xer for more
than 10 minutes.
FORMULA #126
ATF-5
Acid Hardening Rapid Fixer
(Donald B. Alnutt)
Use this formula for fi lm or paper when hardening is desired to reduce fi xing times.
Water at 125F/52C, 600.0 ml
*Ammonium thiosulfate, 60% solution, 333.0 ml
Sodium sulfi te, 15.0 g
Acetic acid, 28% solution, 55.0 ml
�Boric acid, granular, 7.5 g
Potassium alum, 15.0 g
Add water to make 1.0 liter
* 200.0 grams of ammonium thiosulfate, crystalline can be used.
�Dissolve the boric acid separately in a little hot water and add this last.
FILM: Use undiluted. With a fresh bath, clearing time should be approximately 1 to 2 minutes.
Film should be completely fi xed in 4 to 5 minutes. The bath can be used until clearing time
exceeds 7 minutes.
PAPER: Dilute 1:1. Immerse fi ber-base paper for 3 minutes, RC paper for 1½ minutes. If two
baths are used, give 3-and-3, or 1½- and-1½ minutes in each bath for fi ber-base and RC paper,
respectively.
FORMULA #127
Defender 9-F
Rapid Thiocyanate Fixer
Use this fi xer when fi xing has to be completed in a matter of seconds or when fi xing must
take place in very low temperatures.
Water at 125F/52C, 600.0 ml
Potassium thiocyanate, 100.0 g
Potassium alum, 50.0 g
Add water to make 1.0 liter