PE has noted a couple of times that blixes are ineffective at removing the silver from color films, and that separate bleach and fix are really needed for color film processing. I used the Tetnal 3 solution E-6 process a few times a few years ago, and I could definitely see what he means. There was pronounced added density. (This is quite evident in the pre-exposed markings along the edges of the film, which are often invisible when processed in the Tetnal chemicals but are clear with the Kodak 6 solution kit.)

These days the only kits readily available for either E-6 or C-41 use blix. Has the blix been changed and improved enough to correct the previous problem? If not, can a simple bleach be used ahead of the blix to correct the problem?