Gay Judson on fri 24 sep 10
I appreciate all the suggestions offered, on line and off, for finding a =
=3D
solution to my 'spotty' majolica. I think Bonnie really hit on the =3D
problem--stimulated by Sharon's comment. I had washed off the glaze and =
=3D
decoration on 5 of the 6 pots because I was not satisfied with my =3D
designs. In addition, these pieces did not get a full bisque firing--my =
=3D
breaker on the kiln stopped the firing before completing the program. I =
=3D
am certain that the bisqued pieces had not completely dried before I put =
=3D
them in the kiln. They were, of course, dry to the touch. I heated the =
=3D
kiln to 250 degrees F and held the temperature there for 2 hours to be =3D
sure everything was dry before continuing with the firing. I believe =3D
that 'overwetting' was the culprit this time. =3D20
I think I learned a lot about working with majolica from all the =3D
responses I received. I am grateful, as ever, to Clayart for the world =3D
of information it provides through the generosity of its many members.
Thanks to all, Gay Judson
On Sep 20, 2010 Sharon wrote:
>> Re; white spotting, in addition to what's been offered here, I've =3D
found
> that overwetting the majolica glaze with the pigments can cause this. =3D
In
> other words, it truly is a one brush stroke deal.>
On Sep 21, 2010, at 6:18 AM, Bonnie Staffel wrote:
>=3D20
> Following this line of thinking as a solution to the problem, I also =3D
found
> that if I loaded the kiln before the decorated pot was dry, that the =3D
white
> spotting occurred. After that deduction, I left the decorated pot to =3D
dry
> thoroughly before firing and the problem stopped. I often sprayed the =3D
colors
> for the background and/or did the one brush stroke to apply a wash. My
> thought was that it was steam coming from the bisque base causing =3D
boiling
> action from the white glaze below. I fire to Cone 9 regularly.=3D20
>=3D20
| |
|
