When pyrogallic acid was first employed in photography, it was quoted at 21s.
(80 parts) of water with the aid of heat, and the pyrogallic acid is then added.
Herbert B. Berkeley recommended the use of sulphite of soda with pyrogallic acid to prevent discolouration of film.
This is said to be prepared from harmless vegetable materials, but really consists of pyrogallic acid and nitrate of silver.
The plate is then exposed and the latent image developed by an aqueous solution of pyrogallic acid, or protosulphate of iron.
Two fluids, one of which is a solution of nitrate of silver in ammoniacal water, and the other a solution of pyrogallic acid.
The cobra venom was mixed with a feebly alkaline solution of pyrogallic acid, and injected subcutaneously into a chicken.
pyrogallic acid, and the juice of walnuts, also stain the skin, although less intensely and permanently than nitrate of silver.
It is then immersed in mercuric chloride for half an hour, and again intensified with pyrogallic acid.
I have used Merck's pyrogallic acid, and prefer it to all others.
pyrogallol py·ro·gal·lol (pī'rō-gāl'ôl', -ōl', -gô'lôl', -lōl')
A white, toxic crystalline phenol used as a photographic developer and to treat certain skin diseases. Also called pyrogallic acid.