Substituting Hypo with Ammonium thiosulfate?

[thedetective06]

Hello,
I've been wanting to develop ECN-2 from raw chemicals. Ammonium thiosulfate is quite hard to source here in small amounts, so I've been wanting to substitute it with Hypo. I know C41 & ECN-2 fixer (which uses Ammonium thio) works on B&W, but I'm wondering if it will work in reverse because of the thiosulfate ion. Will I just have to change the fixing time? Or will the pH be affected?

 

[koraks]

Welcome to Photrio!

Modern Kodak color negative films (including Vision 3) are at least in part based on T-grain technology. This means they'll fix out very, very slowly in a plain sodium thiosulfate fixer. You could try adding a bunch of ammonium chloride etc. to try and make a quasi-rapid fixer; this might work OK, esp. on the higher temperatures of a color negative process. However, I'd recommend trying to get some C41 fixer instead, which will be guaranteed to work.