Lili Krakowski on thu 24 feb 05
About those porous roof tiles. The woman well may have sprinkled =
lead--God rest her soul. =20
I have doubts about lowering the firing temp with cullet, simply because =
how would they get it?
There are roof tile ads on the Internet and maybe someone knows someone =
who could help. =20
I looked in Pioneer Pottery, and there was only one item of interest =
here. And that is that some of these brick kilns in Africa are fired =
with wood. He also speaks of 900 degrees C. which is c.010.
What if the stuff this woman sprinkled was dried lye? If she washed the =
ashes from the fire and then sprinkled that on? YES LYE IS TERRIBLY =
CAUSTIC AND CAUSES BURNS but she may have worn gloves and eye protection =
and like that....She may have mixed her lye with something like flour or =
saw dust and then dried the whole thing and sprinkled it on. Is there =
no way a sample of a "good" tile could be looked at some college/ lab? =
I do not have a lab...but some Clayarters do....
Or, and I am not clear when she added the magic powder, could she have =
made a self-glazing clay out of their clay body, by adding ????? to the =
body itself?
As to Albany substitutes. Red Art contains more iron than Albany did, =
and my own Albany replacement is 580 gms Red Art, 80 Dolomite, 25 =
Whiting. As I mix it by volume it is 7.5 cups, 1/2c + 1/4c. + 1t, and =
1/3c + 1T.=20
As explained elsewhere before, I have found that in measuring out glaze =
materials 3/4 c is not necessarily the same as 1/2 + 1/4 ( I assume =
through packing down.)
I have had no problem replicating reds. I have no idea what Laguna's =
mix is--but I would play around with the extra iron and the rutile...
Lili Krakowski
Be of good courage
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