Slumping Glass in Platter

I created a bigger platter and cut out an oval in the center. I took that oval slap and used it as a template for a separate slab, where I would slump glass into. After I had bisqued the platter and template, I glazed the platter, still using my turquoise and charcoal gray underglazes to cone 6. I also fired the template in the glaze firing, without glaze, so that it would shrink equally to the platter. Once the platter and the template were fired, I layed glass on top of the template to slump into, in order to attach it to the platter once it was fired. However, I was worried that the oval shape in the template and the platter shrank differently and I feared that the template oval was slightly smaller and therefore would not fit onto the platter. So, I decided to not only slump the glass on to the template, but on the actual platter as well.

After the slumping firing, I found that neither method worked. The edge on both the template and the platter was too sharp, and cut the glass as it began to slump, letting the glass fall onto the kiln shelf.

While this was not successful in terms of the outcome, I now know that glass can be easily cut in the firing process, and I will keep in mind beveling the edges beforehand.