It is always a surprise when one opens a kiln, no matter how many times we fire a glaze kiln, it’s always an anxious experience. The chemical and physical changes from bisque ware that’s just been glazed to a fully fired item is always a spectacular process. All it takes is a few hours and about 1200° C, (2160° F)
The two above images are of the same tumbler, before after and the glaze firing. You can really see the dramatic change from powdery flat pigments to rich glazed textures. This tumbler was a tri-blend test, just to see the effect of three different layers of glaze and how they effect each other.