TF2 vs TF4 for Pyro MC (and devtimes)

[PieterB]

Yesterday I developed my first pyro negative, Foma 400 in Pyrocat MC.
They look "OK"

As suggested I used an alkaline fixer, TF2 from the darkroom cookbook.
Is there any reason not to use TF2? Because I see mostly references to TF4.

I used an intermediate water bath, but plan on using a 1/2 strength stop bath next time.
---
One extra question is about dev times. Is there some summary list somewhere?
The times mentioned here diverge from those I see on flickr or devchart...

For across I am sure, but I am not yet sure about:
- TMY-2 : 1+1+100 21C (70F) 15:30
- Foma 100 ?
- Foma 400 (used 16 minutes for my first attempt)
(agitation almost always 1 minute followed by 1/4, 1/2, 3/4)

 

[Rudeofus]

One main difference is Sodium Thiosulfate (TF-2) vs. Ammonium Thiosulfate (TF-4). The latter fixes faster, has higher capacity and generally does better with high iodide emulsions. The good thing about TF-2 is that it's self mixed, therefore you can reduce Sulfite content if that better keeps the stain.

 

[juan]

In order to reduce the number of chemicals I have around, I’ve been using TF-2 for everything over the past 15-years or so. I’ve seen no problem with any negative. I just have to fix longer which isn’t a problem for me.

 

[John Wiegerink]

TF-2 is fine for me. It's all I've used for the 10 years or so. I used to use Pyrocat-MC before switching to Pyrocat-HDC and find it works great with either one. The plus is I can make a large quanity at a time. JohnW

 

[PieterB]

Ok, thanks!. Any idea of the keeping properties of TF-2 when in nicely closed bottles?

 

[trendland]

Ok, thanks!. Any idea of the keeping properties of TF-2 when in nicely closed bottles?

1 1/2 - max. 2 1/2 years - it strongly depends on the number of films you have fixed with.
A real fresh made TF-2 could reach a longer live time.
A nearly exausded solution could be bad
just 3 month later.

with regards