Photographers Formulary and the Anchell books stress the need for fresh glycin. Does anybody have real world experience with the keeping qualities of glycin kept in a cool dark dry storage area? Also, FX-2 stock solutions are said to keep for a year in full sealed bottles. How 'bout partially filled bottles? Back when glycin was sold by Kodak under the Kodurol name, I find it hard to believe they turned their stock over every few weeks, as modern literature suggests is necessary. Or maybe that's why it fell from favor?