lili krakowski on wed 24 feb 10
Bisquing is NOT required. Many a splendid pot was once-fired. What =3D
DOES matter is that IF you bisque you must go high enough so the clay =3D
can survive. I know there are definite technical/scientific terms for =3D
the stages of bisquing--but am not sure of any beyond sintering, and =3D
that the temp at which something sinters is called the Tamman temp.
However. At too low a bisque the clay becomes very very fragile, and =3D
can (seen it) fall apart when wet with glaze. =3D20
So it seems to me you need to test your bisque temp and see how your =3D
actual clay performs.
As to test tiles. They come in all shapes and sizes. Some people =3D
throw or extrude L shaped ones. I extrude T shaped ones that are used =3D
upside down, standing on the cross part. Some people throw small tubes, =
sometimes tapered so they can be stacked. (Like those nice orange cones =
on the road). You can make very small bowls, and test only on inside. =3D
You can make flat ones, and make a "holder" for them to go into the =3D
kiln. Or you can take smashed up bisque set up on a piece of wadding.
I put both white and black slip stripes on my test tiles. You also =3D
can scratch them a bit to make some sort of surface texture.
Only thing of importance: that they be clearly marked and good records =
kept. You want to be able to consult your times over the years.
Be of good courage