I've researched on two other fixer formula because F-24 is a slow fixer. I
want a rapid fixer.

Here are the formulae:

Neutral rapid fixer
ammonium thiosulfate (60% solution) 200ml
sodium sulfite 15g
sodium metabisulfite 5g
water to make 1 liter

+ However, I've read that ammonium in fixer is not for open trays because of
the ammonium fumes.

~

So, here is another formula, the TF-2 Alkaline Sodium Thiosulfate Fixer

Distilled water 1000 ml
Sodium Thiosulfate 250 g
Sodium Sulfite (anhy) 15 g
Sodium Metaborate 10 g

TF-2 will wash out of negative and print materials more rapidly than will an
acid fixer. In jackspcs.com, it was not indicated how long PRINTS should be
fixed in this specific fixer (but it was indicated it should be washed for 30
minutes).

My questions are:

1. The resource for the neutral rapid fixer formula didn't indicate the
length of time for fixing FB prints. How long should FB prints be fixed in
neutral rapid fixer?

2. Which fixer (neutral rapid fixer, or TF-2 alkaline) would you recommend?

3. If TF-2, how many minutes does it take for FB prints to be fixed in this
fixer?  Someone told me it takes 10 minutes to fix prints with TF-2, but an
online source stated it fixes films (3-5 minutes) and prints (no. of minutes
not stated) faster than usual fixers; so I thought, if it fixes faster, then
it should not be 10 minutes like a regular fixer.  How long, really, does TF-
2 take to fix FB prints?

4. I assume that since ther is no alum in either formula, then these fixers
are non-hardening fixers. Is my assumption right?

5.  Is there a rapid, non-hardening alkaline fixer that uses sodium
thiosulphate as hypo (instead of ammonium thiosulphate)?  If you know of such
a fixer, please post the formula here.

6. Would you know other rapid fixer formula/e that would work with FB prints?
If you do, and if you recommend that fixer, please post the formula here.

I have so many questions and the possibilities roll in my head, because I am
so eager to learn chemical mixing.  Bear with me as I am only beginning to
learn mixing my own chemicals. I really hope you could help me.  Thanks.