I just developed my first two rolls of 120 B&W (Ilford HP5+). I do a water pre-soak for a minute. To my surprise, when I poured out the water, it came out stained black. I carried on with developer etc and the negatives came out fine. Is the black stained water normal? I've never gotten it with 35mm developing. If it matters, these rolls were old, having been exposed 4+ years ago - I found them when I pulled my MF camera bag out of the closet . . . Incidentally, I used the full 13 minute development time recommended by Ilford and the Massive Dev Chart for D76 1:1. I've read that Ilford's recommended time is too long, but it seemed to work fine.