Hello guys, I bought this tetenal c-41 5 liter kit from freestylephoto link below and it comes with one 1000ml bleach fix part A and one 1000ml bleach fix part B and I'm suppose to mix them together. I was wondering if I could use the Part A as a bleach and part B as a fix? Or Do I have to mix them and use it as blix? I've heard it's better for film to use separate bleach and fix. http://www.freestylephoto.biz/102228-Tetenal-C-41-Color-Negative-Processsing-Kit-5-Liter Many thanks in advance!