: Kabe - Viewing Profile

Wow!!!! I'm in love!!! Thank you for sharing this.

I don't remember making a cast from I fired tile, so I'm not to much help in that area. I know that there are some great discussions about plaster casting in the posts. You can buy mold release for plaster casts, I use Murphy Oil Soap and it works for what I do. I tryed vasaline once and it made the cast soft, also the plaster has to be able to absorb moisture and I think the Vasaline would hamper that. Maybe my oil soap does too never though about that part before. Potters Plaster is at least 5 headachs better than hobby grade molding plaster, It is not hard enough does not hold up. I don't know what you bought. If your carvings have under cuts you will not be able to get them loose from the cast no matter how much release you use. I don't know how deep your cuts are. That's the few things that I know. Try looking back through the old posts, there are some very talented and skilled artists out there. The next one reading this may have just the thing. Happy Firing

Marcia Selsor, on 27 November 2012 - 07:59 AM, said:

Hi Marcia. A friend of mine said someone in one of his college classes made some tile and when they were fire the tile "cupped" I guess that would be the word. They were like upside down bowls. I thought about this abit last night and maybe that would be more like a situation where if the glaze was on a pot it might of shivered and if thetile warped the oppisite way and the edges all pulled up it would be like crazing. It would be interesting to manipulate a glaze both directions and apply the test glazes to thin tiles and observe the effects. happy firing

I do tile work and seldom have warpage but I mix my own clay and use a lot of grog. Let me ask this as a question because I might be way off base here. Could it be that the glaze is to tight and instead of crazing you are getting shivering. Seeing that it is a flat tile and not a circular surface maybe the edges are pulled up by the difference in thermal expansion. I know that shivering can tear a pot apart. I have a glaze that will break a porcelain pot everytime I try it. I do not know what glazes you are using or if all your tiles warp or just certain ones. Maybe someone who is better informed could tell if this is possible. Happy firing

Mark McCombs, on 17 November 2012 - 05:58 PM, said:

Julia Gallaway has a website that has some cone 6 white claybody's on it. I have made up a small batch of one of them, but I haven't ran any tests on it. might take a look there. Happy firing