A memory information storage control method is executed by a control unit which carries out a memory information storage process to generate memory information related to a program being executed by the control unit and to store the memory information. These dyes include a donor dye with an absorption maxima at a wavelength between about 250 to 450 nm and an acceptor dye which is capable of absorbing energy emitted from the donor dye. The item color is stored as at least one custom target color in a computer-readable storage medium of the printing apparatus. Each of the client apparatuses is provided with a display device for displaying a scatter diagram in which the obtained PPM parameters Y and X are plotted on X-Y coordinates. This format is derived from the definition of the input message record in the COBOL IMS transaction source file. A dental device embodying an alternative configuration is also disclosed.