The system generates resonant ultrasonic vibrations, preferably in a torsional mode. A method of image tracking includes associating at least one object with a unique identifier and receiving a plurality of images of the object moving in a field of view of at least two spaced apart cameras. The plurality of mixed metal precursors comprises a mixture of inorganic salts and organic acidic salts. Extending from the bulk portion is a tab which defines a diagonal edge.