There's something I don't understand. What is it that gives Ansco 130 such a long life? It doesn't have more sulfite than regular metol-hydroquinone developers. The amounts of metol, hydroquinone and carbonate are also quite common. The amount of bromide is admittedly a little higher than usual, but I doubt that it has any effect on the keeping properties.
So it must be the glycin. But how can glycin influence the oxidation rate of the metol and hydroquinone? A few scenarios spring to mind:
1. The glycin somehow replenishes the metol and/or hydroquinone.
2. The glycin oxidizes, and its oxidation products somehow replenish the metol and/or hydroquinone.
3. The glycin oxidizes, and its oxidation products somehow inhibit the oxidation of the metol and/or hydroquinone, acting like a sort of preservative.
4. The glycin oxidizes faster than the metol and hydroquinone, and by oxidizing it uses up the oxygen in the solution, so that the metol and hydroquinone cannot oxidize as fast as they would otherwise.
5. The glycin is so active that it can develop normally despite the oxidation of the metol and/or hydroquinone. In other words, the developer works fine with or without metol/hydroquinone and doesn't care if they oxidize.
I think it would be interesting to mix a batch without glycin and one with glycin only (no metol or hydroquinone), and to compare them with a regular batch of 130. Has anybody tried this yet?