The bleach is used in reversal processing, it is 10g K2Cr2O7 with 24mL of pure H2SO4. I haven't processed much yet (some tests strips) but there is already some precipitate. Just for curiosity, does someone know what it is ? I guess Ag2SO4 ? It darkens with light.
I once got some black crystals (looked like black rice), when the bleach was used four or five times : was this Ag solid or Ag2S ?

Picture of precipitate : http://imageshack.us/photo/my-images/822/imagexegf.jpg/
Picture of crystals : http://imageshack.us/photo/my-images/833/imagejryg.jpg/