Deadly materials
As well as teaching at the University for the Creative Arts, I also teach evening classes twice a week at 318 Ceramics in Farnham. The classes are mixed ability, 'Exploring Clay' class and a throwing class. A few weeks ago, one of my students in the Exploring Clay class came to me to ask for help with a project she was working on. She was carving house numbers into clay slabs for her family and wanted to fill the carved number area with glass. The glass was to be recycled from something and the student made several test pieces with her glass and put them into the kiln to see what would come out. The following week, she had her test pieces out of the kiln and they were surprising.. The glass had melted and formed orange blobs. I asked her what colour the glass was and she produced a jar of broken red glass. I was a little perplexed about how the red glass could have possibly changed into such an intense orange colour and we were scratching our heads for a while un...