Tuesday, May 17, 2011
Recycled Glass Results
The bowl above is the test result for melting recycled glass in this bisque firing to cone 04. In the past I tried melting beach glass in a small pinch bowl to cone 6 over a tenmoku glaze with success.
Next time I melted the same beach glass in a pinched moon bowl over clear glaze to cone 6 and that was successful as well.
In that same firing I also tried melting some green recycled glass over tenmoku with variable results. I also melted green and red glass over various glazes and those colors of glass turned blue or dark, almost black (no photo). And I melted the same recycled glass in terra cotta colored clay bowls without glaze and the glass was not attractive with that clay at all. The white clay shows the glass colors much better.
I determined glass placed over a glaze affects the color and even the slightest variation in glass color can result in a great variation of color when it is melted. For example one piece of red glass turned almost black. I also reasoned some glass might need to melt at a lower temperature to retain it's color. If you have experience melting glass over glazes, please feel free to give me advise on temperatures and types of glass you've used.
So this time I tried melting the same recycled glass samples in a bowl without glaze to cone 04 in this bisque load and I got some great results. Most of the green, red, and turquoise glass retained their colors nicely. I'm loving these glass color results and my mind is racing on how I'll use these with my flowers. The amber glass has variable results and the clear glass well it's clear, not sure how I will use the clear but it might be interesting over a darker glaze.
In this bisque firing I was also going to try firing some square headed nails to see if they held their shape, but at the last minute I decided not to risk the metal nails in the firing. Gary said the metal might have impurities and might sputter inside the kiln. Rather than risk that possibility, I will fire the square headed nails in a covered dish next chance I get in case the metal does sputter at bisque or glaze temperatures.
I'm glazing the bisque load now and it's taking me forever. Since the kiln was full of small items, there's a lot of glazing to do. I'm hoping I can fire tonight. Stay tuned for the Florida clay slip results and some finshed work in a few days.
Recycled Glass Results by Linda Starr is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License.
Based on a work at bluestarrgallery.blogspot.com.