100 year old Amidol is still being used , and is still "good". Amidol ( pre mixed powder) is very stable. It does turn color, but it is still good. Frank Filippone red735i@xxxxxxxxxxxxx Phenidone solid is quite stabile and in the same class as hydroquinone and Metol as opposed to Amidol and Glycin. ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.