Here is a picture of the De-Purpler. It's an Evenheat coffin kiln. The firing chamber measures 25" X 41" X 13.5" deep. It has two viewing windows and a Rampmaster digital controller. Retail price for one of these is around $2500.00 Please don't ask me exactly how to heat an insulator. I ain't say'n. I also don't use my kiln for evil such as decoloring insulators and selling them. But I am willing to use it for experimental purposes.