Hi ... I have been processing my own film for almost a decade ... same for prints. I ordered some new fixer, Arista Odorless liquid concentrate. Did a search here to see what if anything people had to say about it, and I came across some interesting comments. People were talking about how long it took their film to clear. How do you know? I mean, how can you tell when the film is cleared? I have always just guessed conservatively that I had fixed the film long enough. If the negatives were especially important, I used fresh fix for 10 minutes, regardless of brand. For RC prints, 30 seconds; 2 minutes. My question is: How can you tell how long it takes fixer to clear your negatives and/or prints?