I don't know much about glycin, but it is a key component to my particular process.(posted 8249 days ago)I develop my Neopan 400 and Tmax 100 in PF FX-2, and Glycin is present in the mixture part A. The one and only time I have ordered this solution, I got 4 kits, 3 of them looked as though they had been at least packaged at the same time, with similiar labels, etc. The fourth looked older, due to faded packaging and streaky shrink wrap. I mixed this one first. In the kit contains a 15gm black bag of Glycin. It had a tannish color. Mixes hard. (BTW- if someone has a method for dissolving glycin w/o alcohol, please let me know.)
FX-2 also contains metol as a developing agent, 5gm in pt.A.
I haven't really experienced any shift in going from old to newer kits, so I assume it shouldn't matter.
Hope this helps.