John K. Dellow on tue 4 aug 98
>
Barium is used to stop scumming on some terra-cotta clays . Scumming is a
white efflorescence on the fired ware, from i think magnesium salts in the
clay. The old potters who trained me ,said not to use barium containing
clays , because the barium is absorbed through the skin & is poisonous.
john Dellow the flower pot man
p.s. hope this gets passed the moderator
http://digitalfire.com/education/people/dellow/index.html
| |
|
