Quote Originally Posted by Roger Cole View Post
No. That was my concern at first too. There was a thread somewhere on this, maybe LFPF, but IIRC the gist was that the parts weren't separated for longevity but for ease of replenishment. I don't recall the details, but I've kept a bottle combined for more than a year and it still worked fine (squeeze the air out before capping.)
I'd wondered about the little packet as well, but searching the internet did not turn up much info. I found only one or two references where people did not use the packet, and reported no problems.

What I don't understand is, considering the packet is supposed to be added to the full concentrate when first mixing, why would it be separated in the first place? Could it be to "season" the developer? If so, is there a reason that it would not come pre-seasoned (perhaps time-related degradation)?