Nancy on sun 26 nov 06
Has anyone tried this transparent glaze? I made some, did a test tile
on my reclaim clay which is a mixture of Miller 50 and Laguna 66 white
clay. It was fine, no crazing, no clouding, no shivering. I then used
the transparent on the inside of my mugs made with just Laguna 66
claybody. It cracked horribly. I thought it could have been thermal
shock from me. So I refired those pieces and added a couple of newly
glazed pieces. All on Laguna's #66 claybody. Well same
thing...cracking everywhere...to the point I have to throw everything
away because I feel it's not safe to sell or use.
So I am wondering....has anyone had similar problems with the 5/20 glaze
recipe? It is as follows:
20% Wollastonite
20% 3134
20% Silica
20% Kaolin
20% Feldspar
Or does someone have a stable transparent for cone 5-6 that does not
have tin in it?
Thanks in advance
nancy
Donna Kat on sun 26 nov 06
On Sun, 26 Nov 2006 00:19:59 -0500, Nancy wrote:
>Has anyone tried this transparent glaze? I made some, did a test tile
>on my reclaim clay which is a mixture of Miller 50 and Laguna 66 white
>clay. It was fine, no crazing, no clouding, no shivering. I then used
>the transparent on the inside of my mugs made with just Laguna 66
>claybody. It cracked horribly. I thought it could have been thermal
>shock from me. So I refired those pieces and added a couple of newly
>glazed pieces. All on Laguna's #66 claybody. Well same
>thing...cracking everywhere...to the point I have to throw everything
>away because I feel it's not safe to sell or use.
>
>So I am wondering....has anyone had similar problems with the 5/20 glaze
>recipe? It is as follows:
>
>20% Wollastonite
>20% 3134
>20% Silica
>20% Kaolin
>20% Feldspar
>
>Or does someone have a stable transparent for cone 5-6 that does not
>have tin in it?
>
>Thanks in advance
>
>nancy
Mastering Cone 6 adjusts this glaze to make a more stable base. What
surprised me when I first saw it, is that they actually drop the silica
value. (they also add Talc and drop the Wollastonite). I think though that
it is milky where thick. They have a liner glaze that I have not seen even
a suggestion of crazing which I like.
http://www.frogpondpottery.com/glazestability/stableglazes.html
Their Glossy Black is now public. I would not speak for them but I think
this would give you a safe and good clear if you take out all the colorants.
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