From: Neil Miller (neil@miller.gioserve.com)
Date: 01/24/03-08:24:03 AM Z
ox gall is not the same as gall nuts. Ox gall comes from an animal. I used
to use it to thin/bind colours when using water colours to produce marbled
paper.
Gall nuts are small round growths on oak trees, produced by a parasite
(larva of a small wasp). They are also referred to as oak-apples.
Pyrogallol is made from pyrogallic acid - I think it is distilled. Gall
nuts contain - among other things - gallic acid.
Pyrogallol is a staining developer, other staining developers contain
catechol and pyrocatechin (not sure if they are the same thing).
Regards,
Neil
----- Original Message -----
From: "John Glen" <microcrystals2002@yahoo.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, January 24, 2003 12:14 PM
Subject: Ox Gall?
> Greetings!
>
> Some one know what gall nuts are?
>
> What are they and if they are what I think they are,
> is there a substitute?
>
> JG
>
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