One embodiment of the invention is an imaging device comprising an illuminated reference locator that comprises an illuminated surface that identifies an input location that receives an object to be imaged by the imaging device. Some embodiments relate to compounds of Formula I:or a pharmaceutically acceptable salt, ester, amide, or prodrug thereof, wherein R1-R10 are as defined herein. Preferably, an aqueous coating mixture of phosphoric acid, alumina powder, and cordierite powder is prepared.