I think pre-bleach now contains some of the preservative that was previously present in the final rinse, plus something to increase bleach activity. Not sure.
A blix should be OK if the blix is mixed- and used-fresh. If the blix sits on the shelf for a while though, not so good.
Edit: the E6 Process Manual which explains why pre-bleach is there (dye stabilisers, for lack of formaldehyde) amongst other things. Bob, this is worth reading.
Last edited by polyglot; 10-14-2013 at 10:10 PM. Click to view previous post history.