Utrwalacz z kwasem borowym

[rayman]

Cześć.

Znazlem w piwnicy słój kwasu borowego i zastanawiałem się jakie są plusy i minusy stosowania go w utrwalaczu razem z siarczynem. Moje pytania brzmią: Ile go sypać i czy ma on duży wpływ na trwałość utrwalacza?

Przy okazji, dysponuje ktoś jakąś ciekawą recepturą (do papieru i filmów)?

[rbit9n]

nie wiem jakie są plusy, ale mogę Ci zacytować kilka receptur z Anchella:

FORMULA #125
ATF-1
Nonhardening Rapid Fixer
(Donald B. Alnutt)
Use this formula for fi lm or paper to reduce fi xing times. The hardener is optional.
STOCK SOLUTION
Ammonium thiosulfate, 60% solution, 750.0 ml
Sodium sulfi te, 48.0 g
Acetic acid, glacial, 36.0 ml
Boric acid, granular, 30.0 g
Add the acetic acid slowly with stirring. Dissolve the boric acid separately in a little hot water
and add this last.
Optional Hardener
Aluminum chloride, hexahydrate, 50.0 g
Water to make 100.0 ml
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 #129
Kodak F-5
Hardening Fixer
F-5 is the standard sodium-thiosulfate-based formula. Many commercially marketed fi xers are
essentially unaltered versions of this formula. Use this formula for fi lm and paper when hardening
is desired.
Water at 125F/52C, 600.0 ml
Sodium thiosulfate, 240.0 g
Sodium sulfi te, 15.0 g
Acetic acid, 28% solution, 48.0 ml
Boric acid, crystalline, 7.5 g
Potassium alum, dodecahydrate, 15.0 g
Water to make 1.0 liter
FILM: Film should be clear in 5 minutes and fully fi xed in 10. Discard when the clearing time
is close to 10 minutes. The hardener can be mixed separately as a stock solution (see the following
formula).
PAPER: Use the two-bath method, 5 minutes in each bath. Do not use hardener in this fi xer if
you intend to tone the print.

FORMULA #130
Kodak F-5a
Hardener
Water at 125F/52C, 500.0 ml
Sodium sulfi te, 75.0 g
Acetic acid, 28% solution, 235.0 ml
Boric acid, crystals, 37.5 g
Potassium alum, dodecahydrate, 75.0 g
Water to make 1.0 liter
The sodium sulfi te should be dissolved completely before adding the acetic acid. After the
sulfi te-acid solution has been mixed thoroughly, add the potassium alum with constant stirring.
To make an acid-hardening fi xing bath add 250.0 ml of hardener to 1.0 liter of cool hypo
solution. If the hypo is not thoroughly dissolved before adding the hardener, a precipitate of
sulfur is likely to form.
To make a pre-hardening bath dilute 250.0 ml of the stock hardener solution in 1.0 liter
of water. Harden fi lm or paper for 1 minute prior to fixing.

i jeszcze r-rów do płukania:

FORMULA #205
DW-2
Clearing Bath
(David Wood)
Water, 1.0 liter
Sodium sulfi te, anhydrous, 30.0 g
Sodium metabisulfite, 10.0 g
Boric acid, crystalline, 1.0 g
Citric acid, 3.0 g
Clear for 3 minutes at 68F/20C. Discard after 12 rolls of 35-mm 36 exposure rolls of film or equivalent.

pozdrawiam
PRB

[rayman]

Dziękuję, znając mniej więcej proporcje spróbuję sklecić coś swojego - z reguły utrwalam w samym tiosiarczanie bez dodatków