"Pyrogallol" vs. "Pyrogallol A"

[WAn]

Hello,

The Pyrogallol is not available in my city, but in a chemical store there is a "Pyrogallol A". The salesperson could neither tell the difference between them nor to draw the chemical formula of the "A" modification.

 

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Does anybody know what is "Pyrogallol A"? What is its formula? Is it suited for film development and has it the properties of usual Pyrogallol?

 

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Thanks

[ed b.]

Pyro formulas come in two parts, usually labelled A and B. A

contains the developing agent, and B contains the accellerator. I

suspect you have a bottle of A with no B to go with it.

[WAn]

No Ed, thanks, but I don't think so: it is a _chemical_ store, not a

photo store; the sales people there aren't even aware that the

pyrogallol can be used as a photo developer.

 

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I browsed my chemical reference books, but could not find any

information about such an item. My only hope is that may be there are

chemists reading this board that can advice, or may be the "A" is

commonly known modification..

[ed b.]

Andrey, Didn't mean to sound condescending--just trying to help. I

wonder if it could stand for acid? Another name for pyrogallol is

pyrogallic acid.

[WAn]

Ed, great idea!

In any case I have to buy and to try it: no other way for me to get

the pyrogallol. But your last note encourage me :)

 

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Thanks!

[michael_suarez]

The Pyrogallol you mention is one of two abalable chemicals, one is

for technical use and the other which is more pure or chrystaline for

photographic or scientific uses is the anhydrous form, (no water in

it's molecule, Pirogallol A.

[vlastik_h]

Pyrogallol is trihydroxybenzen.