A method of a stirring a molten glass which includes an analytical model which may be used to optimize the stirring conditions to minimize refractory metal inclusions which may result from the stirring operation. The method includes the steps of providing animal tissue having an average size of between about 0. Also disclosed are various compositions including the dispersions including oxidation-reduction imaging forming compositions, thermographic elements and photothermographic compositions and elements. The input and output switches in the trace banks are controlled to provide a transmission path of the desired length.