Quote Originally Posted by tkamiya View Post

Thank you. Please explain first two points you made for me.... You said "the mixed developer keeps for ages" then said "concentrate doesn't keep at all" You mean once diluted, the devleloper keeps LONGER? That seem backwards.
My experience with Kodak RA4 dev: unopened bottles of concentrate go bad in around 2 years, mixed developer in plastic pop bottles squeezed to get out all the air is still good after 18 months.

When our baby boy was born I didn't get into the darkroom for a good 18 months. When I did my unopened dev concentrate was bad, however stuff I'd mixed up 18 months prior was good.