I have kept a bottle of D76, a kodak fixer, and a bottle of unused kodak stop bath for more than a year. none are mixed and they are in their original plastic bottle. Can they still be used or should I discard them? what would be the best environmentally safe way to discard them? or are they still useable?(posted 8371 days ago)I also have a Liquid Emulsion, unused, how long can i keep it and still be able to use it?