Keeping Glycine

[Stuart Spigel]

I recently learned that a solution of phenidone in ethylene glycol will keep almost indefinitely, Could the same be applied to glycine/glycin? My query is about solubility and, of course, activity.

Thanks.

 

[Patrick Robert James]

I've had really good luck freezing it. I had some last for four years I think it was. I kept the lid taped up and left it inside the black plastic bag it came with. After using a little here and there, in the end it was only slightly off colored, but minimal, and still worked fine. That doesn't answer your question about making a solution, but maybe answers the part about making it last.

 

[Stuart Spigel]

I've had really good luck freezing it. I had some last for four years I think it was. I kept the lid taped up and left it inside the black plastic bag it came with. After using a little here and there, in the end it was only slightly off colored, but minimal, and still worked fine. That doesn't answer your question about making a solution, but maybe answers the part about making it last.

Thanks for your response, Patrick. Good idea.

 

[Stuart Spigel]

I also wonder if there is some relevancy to a similar "keeping" perception about amidol, ie that old, discolored amidol has lost its potency when, in fact, practical experience of a respected printer revealed that 100 year-old amidol that he had a supply of worked just fine.

I have some 10 year-old glycine which is now gray. Think I'll mix some up and just give it a try.

 

[Wayne]

Its glycin btw, glycine is not a developing agent.

It doesnt keep as well in solution as it does in the freezer, I know that. If really long storage is your goal, freeze it. I've had Ansco 130 last for a couple years but frozen "powder" lasts much longer.

Once glycin turns brown it will stain paper. Few people will find that desirable so its activity at that point is moot.

 

[Patrick Robert James]

I used some really old brown Glycin once to make some paper developer. It stained the paper a little like Wayne said, but it looked kinda nice. It had a bit of a rose color to it.

 

[Stuart Spigel]

Currently, I plan to order 100gms of fresh glycin from PF. Will then mix up 2 batches of 130 containing, respectively, "old" and "new" glycin and post the results.

Thanks to all for the input.

 

[Photo Engineer]

I emphasize that comment above. Glycine is not the same as glycin.

PE

 

[Alan Johnson]

IIRC, it may be needed to react glycin with TEA first to get it to dissolve in glycol. This is what is done to get metol to dissolve in glycol.