Formulary TEA now 85%

[ntenny]

This might be old news, but I just opened a bottle of TEA from the Formulary (bought about a year ago), and the contents were much thinner than past batches. Previously, I’ve found their TEA very difficult to draw into a syringe, and this batch flowed right up, about like the old HC-110 syrup. My ascorbic acid also seemed to dissolve faster in it than I’m used to, but that may be just because the stirrer had an easier time spinning in the thinner medium.

Checking the SDS revealed that the Formulary now list their TEA at 85%, with the rest claimed to be diethanolamine. I’m pretty sure it used to be listed higher. I went ahead and mixed up a batch of PC-TEA as usual, and my test roll looks fine to the eye, but I wonder if there are photographic implications to this change. Has anyone done real testing on developers mixed with 85% TEA vs. higher concentrations?

-NT

 

[John Wiegerink]

This might be old news, but I just opened a bottle of TEA from the Formulary (bought about a year ago), and the contents were much thinner than past batches. Previously, I’ve found their TEA very difficult to draw into a syringe, and this batch flowed right up, about like the old HC-110 syrup. My ascorbic acid also seemed to dissolve faster in it than I’m used to, but that may be just because the stirrer had an easier time spinning in the thinner medium.

Checking the SDS revealed that the Formulary now list their TEA at 85%, with the rest claimed to be diethanolamine. I’m pretty sure it used to be listed higher. I went ahead and mixed up a batch of PC-TEA as usual, and my test roll looks fine to the eye, but I wonder if there are photographic implications to this change. Has anyone done real testing on developers mixed with 85% TEA vs. higher concentrations?

-NT

The viscosity changes with temperature variations also.

 

[ntenny]

The viscosity changes with temperature variations also.

True. The temperature in my darkroom is very stable, though, and this is clearly much thinner than the old stuff in an apples-to-apples comparison.

-NT

 

[dcy]

The viscosity changes with temperature variations also.

Only gradually. I'm sure OP's darkroom isn't at 60°C.

 

[dcy]

Checking the SDS revealed that the Formulary now list their TEA at 85%, with the rest claimed to be diethanolamine. I’m pretty sure it used to be listed higher. I went ahead and mixed up a batch of PC-TEA as usual, and my test roll looks fine to the eye, but I wonder if there are photographic implications to this change.

Well, I guess I won't be buying my next batch of TEA from PF. I do not have the energy to try and figure out if or how to adjust the PC-TEA recipe or the way I use it in order to compensate for adulterated ingredients. ArtCraft chemicals has TEA.

 

[john_s]

Isn't DEA in water more alkaline which would mess up developers relying on TEA for pH level?

 

[Alan Johnson]

XTOL patented?

Patrick; The top graph is of binary, not ternary mixtures. I misread the graph and I apologize. This is a plot of the melting point of the 3 Ethanol amines as a function of water content. The second plot is actually a pair and I missed the second plot. You need both to get pH vs...

www.photrio.com

Gainer said the commercial version is not necessarily an inferior product. But neither he or Sandy King who seems to have done most of the pH measurements seem to have done any comparison of PC-TEA made with the 99% and commercial grade TEA.

 

[ntenny]

XTOL patented?

Patrick; The top graph is of binary, not ternary mixtures. I misread the graph and I apologize. This is a plot of the melting point of the 3 Ethanol amines as a function of water content. The second plot is actually a pair and I missed the second plot. You need both to get pH vs...

www.photrio.com

Gainer said the commercial version is not necessarily an inferior product. But neither he or Sandy King who seems to have done most of the pH measurements seem to have done any comparison of PC-TEA made with the 99% and commercial grade TEA.

Thanks, that thread is fascinating, albeit not totally conclusive. Putting together tidbits of information from that discussion, I gather the following:
1. DEA should raise the pH of the mixture, hence probably a more active developer;
2. DEA is a stronger silver solvent than TEA;
3. The effect of the DEA mixture on the freezing point is unclear;
4. Pat Gainer mentioned using 99% TEA from the Chemistry Store, so it might be a fair guess that his original recipes were made with that.

I don’t have precision tools for developer testing, so I’m at a bit of a loss. I could toss the batch of developer and order some higher-purity TEA. I could go ahead with what I’ve got on the theory that if I can’t see a putative problem it doesn’t matter. I could take a stab in the dark and cut my developing times a little to try to compensate for expected higher activity. I’m open to thoughts on all of these possibilities.

-NT

 

[halfaman]

DEA will not make your TEA thinner. On the contrary, DEA has a higher melting point than TEA and the mixture should be thicker at room temperature. 99% TEA will be thinner than 85% TEA + 15% DEA at room temperature.

And there is another 85% TEA presentation, at least in Europe, that has no DEA but 15% of water...

 

[Alan Johnson]

The Photoformulary site gives an SDS which specifies a freezing/melting temperature of 15.8C 60.4F for the DEA containing version if you care to check.

 

[retina_restoration]

This might be old news, but I just opened a bottle of TEA from the Formulary (bought about a year ago), and the contents were much thinner than past batches. Previously, I’ve found their TEA very difficult to draw into a syringe, and this batch flowed right up, about like the old HC-110 syrup. My ascorbic acid also seemed to dissolve faster in it than I’m used to, but that may be just because the stirrer had an easier time spinning in the thinner medium.

Checking the SDS revealed that the Formulary now list their TEA at 85%, with the rest claimed to be diethanolamine. I’m pretty sure it used to be listed higher. I went ahead and mixed up a batch of PC-TEA as usual, and my test roll looks fine to the eye, but I wonder if there are photographic implications to this change. Has anyone done real testing on developers mixed with 85% TEA vs. higher concentrations?

-NT

Have you messaged PF to ask them about this, and inquire whether or not it has any practical implications? Seems to me that's a good place to start.

 

[dcy]

And there is another 85% TEA presentation, at least in Europe, that has no DEA but 15% of water...

Wasn't part of the purpose of using TEA to avoid mixing Phenidone in water?