Hi William!
This is an excellent piece of information that I was looking for. This is
what exactly I needed to know.
Many many thanks for this information. It helped me. Just a few while ago
I was spending some time in library to find out the concentration. In one
book it was mentioned to 40%, i.e., in 1000gm of water which is equivalent
to 1000 ml of water one should dissolve 400 gm of hypo crystal. I decided
to proceed according to that but all of a sudden it came to my mind that I
should check the mail to look for some feedback and yes I got a very
useful piece of information for me just befor adding those crystals to
water at 50 degree centigrade. I read that the dissolution of crystal in
water is and endothermic reaction and therefore the temperature of the
water has to be raised to 50 degree centigrade.
Thank again for the efforts you have put. Now I can safely proceed.
With best regards,
Ayash Kanto.
On Thu, 10 May 2001, William Robb wrote:
> Hi Ayash:
> I did a little research for you. Here is what I found:
>
> Ilford Ilfofix (from powder) has a specific gravity of 1.185
> when correctly mixed to stock solution.
> A package with a net weight of 1175 grams makes 5 litters of
> fixer.
>
> Some old Ilford fixer formulas call for 400 grams of Sodium
> Thiosulfate (hypo crystals ) per litre for films and 200 grams
> of Sodium Thiosulfate for paper.
>
> For films, use stock solution undiluted, for paper, dilute stock
> solution 1:1 with water
>
> Ilford's capacity information for Ilfofix is 1.375 Sq. Meters of
> film per litre and 2.75 Sq. Meters of paper per litre of stock
> solution.
>
> With this in mind, I would try mixing your package of Hypo II to
> make one litre of stock solution. Use it undiluted for film, and
> diluted 1:1 for paper.
> Fix films for twice the clearing time, fix paper for twice as
> long as your film fixing time.
> Discard the fixer when the clearing time is double it's initial
> time.
>
> To determine clearing time, take a short piece of raw film stock
> and dip a centimetre of it into the fixer for 15 seconds, then
> immerse the rest of it. When the first part to be immersed is
> the same density as the rest of it, the film is clear. My
> experience with powdered fixer is an initial clearing time of
> about 2 1/2 minutes.
>
> William Robb
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