Frequently we hear of kitchen ovens being used to cure some of the fneishis with complaints of the resulting fumes. Proper ventilation should be used in any baking process and there are by-products produced by heating any chemical base. We recommend using an oven outside the living area due to various inherent dangers with heating chemicals in a closed area. A simple oven can be made from a black iron bluing tank, thermometer, and camp stove for instance.