Abstract: A method and apparatus of engraving three-dimensional images onto metal or the like and creating unique graphic images which are unique images created by engraving the images into architectural metal such as steel, aluminum, brass, copper, etc. The method and apparatus comprise a computer numerical control (CNC) router which can rotate at speeds of approximately in a range of 4,000 RPM to 6,000 RPM, a bristle disc installed into the CNC router and a pressure mechanism for applying sufficient pressure on the bristle disc so that rubber bristles are caused to be embedded approximately 0.060 inch into a metal surface as the CNC router causes a three-dimensional image to be engraved into the metal surface.

Abstract: A method for preparing a sulfide phosphor where a raw material mixture for a sulfide phosphor is placed in an almost closed first heat-resistant container and fired therein, the method being characterized in that an auxiliary material composed of carbon and/or a carbon-forming compound capable of being pyrolyzed at a temperature not higher than the firing temperature to form carbon, and a metal sulfide capable of recting with the carbon and/or said carbon-forming compound at a temperature not lower than 600.degree. C. but not higher than the firing temperature to form a carbon sulfide is placed in the portion as physically separated from the raw material mixture for the sulfide phosphor in the said first heat-resistant container and the firing is conducted under such condition so that said first heat-resistant container may have a carbon sulfide atmosphere by the thermal reaction of the thus fired auxiliary materials.