Laura Moon on fri 1 mar 02
Hi All!!
I saw a picture of a terra cotta pot in a book. It said it was washed with a
"colloidal stain" before the glaze. It was a milky white matt finish. Does
anyone know what this is, any recipes perhaps? Any help would be appreciated.
Thanks,
Laura Moon in cool breezy Lake Worth, Florida
Millie Carpenter on sat 2 mar 02
colloidal means a glutinous or gelatinous state of being in water or
another thin liquid. most of the time I think of colloidal oatmeal that
you buy at the pharmacy to put in a bathtub when you have chicken pox,
poison ivy, or sunburn. also corn or potato starch, flour, arrow root,
and a few other natural substances which make gravy are all colloidal.
so basically it is stain in water with something to keep it suspended
so that it wont sink to the bottom. according to Hammer in a glaze it
is the particles of color that are suspended independently in different
spots within the finished glaze. the distance and size of the particles
determines the shades this is what gives semi-transparent glazes their
depth and can give that opalescent or crystaline effect
but I would guess that it is a stain or oxide mixed in water with a bit
of gerstley borate or a fritt rather than added to a slip.
the neat thing for me is that I am beginning to understand what is going
on.
Millie in Md. counting down to NCECA. 10 days until take off (for
me at least)
Laura Moon wrote:
>Hi All!!
>
>I saw a picture of a terra cotta pot in a book. It said it was washed with a
>"colloidal stain" before the glaze. It was a milky white matt finish. Does
>anyone know what this is, any recipes perhaps? Any help would be appreciated.
>
>Thanks,
>Laura Moon in cool breezy Lake Worth, Florida
>
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