Process
• Marbleware •
Tim's "marbleware" pieces use a clay frame and glass marbles which are set in a pattern and melted in the kiln. This allows a general idea to be laid out beforehand, but what happens in the kiln is always a surprise and means that each piece is completely unique.
Experimenting is very important for this process. Some types of marbles work, and some cause problems. Some colors have a unique appearance when fired. Certain color combinations can have unexpected results, so it is important to know how each combination works together. All of these factors are important in setting up patterns that will look nice when finished.
Once fired, a series of coatings are applied to the glass, ending with a thick epoxy coating. This is for several reasons. When the glass cools in the kiln, it cracks, and because it is thick, the edges can be sharp and chips can form. This coating levels the surface and serves to protect against these hazards. Because it gives a nice level surface, it also helps the colors and patterns in the glass stand out. Finally, the cracks in the glass can continue into the clay and make the piece weaker. The coatings get into the cracks and help strengthen the entire piece.
However, these coatings do require some care. Because of them, these pieces are not recommended for dishwasher use, and should not be stored below freezing for a significant period of time.