This may be true of Neutol WA, but I wouldn't assume it to be true of Neutol Plus. PC developers in general have an iffy reputation for longevity. I vaguely recall seeing claims of Neutol Plus going bad in the bottle in only a moderate period of time. Of course, since it's a paper developer, this isn't as bad as a film developer going bad, but I certainly wouldn't recommend that anybody buy more than a few months' anticipated supply of Neutol Plus (or the Tektol products I mentioned in an earlier post).the keeping properties of Neutol are, in my opinion, on par with Rodinal. Buy a big bottle and it'll last a long while.