Photographic Emulsion Stabliizers

[hrst]

Shopping these doesn't seem very easy. Tetra Aza Indene has vanished from the Formulary's list. I'll try to ask them if it's still available, but in the meantime, can any of you say if this is the same substance;
http://www.sigmaaldrich.com/catalog/...AND_KEY&F=SPEC
7-Hydroxy-5-methyl[1,2,4]triazolo[1,5-a]pyrimidine

It seems to have the same CAS number, but the naming of organic chemistry is not too easy . At least when I have only high school chemistry as my theoretical background.

[Photo Engineer]

The Formulary has TAI both as crystals and as a solution as described by Jim Browning on his web site.

The chemical you have above is the correct stabilzer. It is drawn upside down from the convention I have.

PE

[dyetransfer]

The Formulary has TAI both as crystals and as a solution as described by Jim Browning on his web site.

PE

In Fact, the TAI that the Forumulary has is the same stock that I used, I sold it to Bud along with all the coating / drying / emulsion making equipment. I got 3 Kg of the stuff from Allied, it wasn't too expensive in 1Kg bottles. Not sure if you can get it from them anymore - the contact is listed in my manual.

Regards - Jim Browning

[hrst]

Interestingly, when I contacted Formulary, they said they don't have TAI and never had it. I mentioned the names of Ron and Jim but they didn't answer to that.

But, I managed to get an account from Sigma-Aldrich, so I ordered TAI, PMT and MBI. Had to sign a customer declaration for PMT

I also bought some cryptocyanine for panchromatic experiments...

[Photo Engineer]

I'm surprised, because the TAI solution was in their catalog. I saw the bottle of the solid chemical there on my last visit.

In fact, I made up the original solution for them to show them how it was made and I wrote the procedure up.

PE

[Photo Engineer]

I checked with the Formulary and they have responded that they do have it as both the working solution and as the pure compound. It was a simple error that slipped through.

PE