I have been developing some slides with the Tetenal Colortec E-6 Kit, it was pretty good at the beginning. However after a couple of rolls, some e100 and provia, the recent two rolls, elitechrome 100 and e100plus both have a very bad purple shade. I suspected the blix is failing but after a prolonged blix bath. The film looks the same. Any idea what the problem might be? The rolls are expired but so are the earlier ones I developed. The first half roll of the elitechrome actually looks ok, but the purple tint suddenly appear on the second half. Does anyone have some idea what the problem with my process is? Thanks so much!