Response to Glycin shelf life

I just bought glycin from Photographers Formulary. They supposedly make it up every couple weeks because of the aging issue and were extremely concerned that I use it quickly. We even discussed flooding the top of the bottle with nitrogen or argon to retard oxidation. They ship the bottle in an opaque black plastic bag to keep it out of the light. Color on receipt was a slightly yellowish off-white, but closer to white than anything. OTOH, old literature never mentions special precautions or aging, so I don't know how big an issue it is. I've also read that phenidone doesn't keep terribly well dry, but mine is at least 15 years old and still seems active. Don't ask about my hydroquinone- it's a big Mallinckrodt can dated 1960, but still seems ok in color and potency.

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