Glycin is soluble in alkaline solutions. It is only slightly soluble in water. In my experience it is very stable in both Agfa 8 film developer and in Ansco 130.
Agfa 8 Film Developer
Deionized Water @ 125 Deg F 750ml
Sodium Sulfite 12.5 grams
Potassium Carbonate 25 grams
Glycin 2.0 grams
Deionized Water to 1000ml
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