Quote Originally Posted by MikeK
My problem is with the raw glycin before it is put into solution. Wthin 4 weeks or so it has turned light brown and nowhere near as potent as fresh.

Glycin is described in the chemical lliterature as a light tan colored powder. I have aquired Glycin from two different sources, and it is indeed a light tan (or brown) powder in both cases. My Glycin is stored in amber glass containers which are kept in a cabinet around 21 deg. C under low humidity conditions. I have seen no change in the powder color and no change in activity over several months.