I work in a technique that is sometimes called vitreous, or glass mosaic. I manipulate minute pieces of glass, called frit, some ground to a powder, to form an image. I apply multiple layers of glass, sometimes firing four or five times between layers to build up the depth and detail I want in my work. There is absolutely no paint involved and I use no medium to hold the glass together. That's accomplished in the firing stages where the glass melts to a solid slab.
The finished product will have been through many days of layering glass and firing in a kiln to around 1500 degrees, then sandblasting, cold working and firing again. Most of my work is 1/2" to 1" thick and the image can be seen from both sides. The work is displayed in a metal table top stand.