Quote Originally Posted by Tom Hoskinson
I bought a kilo of phenidone from Ilford in the early 1970's and the remainder is stilll fully active. I broke it up into 10 100 gram lots, bottled it and sold 7 bottles at the time to friends. I have kept the remainder cool, dry and stored in sealed amber glass containers.

Dry phenidone powder has a very long shelf life - many years. In water based solutions, the shelf life is limited. Water based solutions of phenidone can lose strength and fail without warning.

On the other hand, phenidone dissolved in glycerine, glycol or triethanolamine has a very long shelf life (as long as no water is added).

Tom,

I also have some very old phenidone that appears to be fully active.

On the other hand, I checked a small bottle of glycin from the same period and it was totally worthless. The white powder was very dark brown and had virtually no activity.

Does glycin dissolve easily in propylene glycol? If so this his might be a good way to store it.

Sandy