Chemistry Shelf Life

I would give a try If they are bad you will notice it quickly, CD concentrates are transparent, be cautious if you see other color and discard inmediately if they have an intense blue or brown color. Same thing if you see sediments in Blix A or strong "rotten eggs" odour in Blix B.

One thing I have noticed with Tetenal and others is that they do not put any manfacturing or expiration date in their products.

I did have an issue with Blix A in the last batch of my first Tetenal E-6 kit. There was a yellow precipitate, but I mixed it up anyway and it appears to have worked. That was stored in the original bottles so there was a lot of opportunity for oxidation. Since then the concentrates get decanted into 100ml bottles (glass for CD!!!!) and there doesn't seem to be an issue.

Please mix them up and let us know how it works. If E-6 chemistry will last 5+ years unopened, that means I can stock up on enough film and developer to keep me shooting beautiful transparencies for pretty much the rest of my life.