My saggar fired work is usually wheel thrown, dried, and bisqued to 1900 degrees F.  Thin copper strips and steel wool (which burn off) are attached. The work is loaded into a large steel drum, surrounded with brine-soaked and dried combustibles (wood shavings), and sprinkled with salt and copper sulfate. Broken pottery shards are placed in areas to help direct the flames.  The drum is carefully loaded into the kiln, which is fired to 1850 degrees F. The following day, the vessels are removed, washed off, and allowed to dry.  They are then sprayed with a clear protective acrylic coating.