Printer and non-transitory computer readable storage medium

A non-transitory computer readable storage medium storing a printing program executed by a computer, the computer being configured to perform control of periodically supplying power to a plurality of heat generating elements of a thermal head, the thermal head including the plurality of heat generating elements configured to apply energy to a recording medium, the recording medium including:

• a first color developing portion configured to develop a first color in a case where a temperature of the first color developing portion exceeds a first temperature;
• and
• a second color developing portion configured to develop a second color in a case where the temperature of the second color developing portion exceeds a second temperature lower than the first temperature,
• the printing program comprising instruction that, when executed by the computer, causes the computer to:
• periodically supply the power to the plurality of heat generating elements until an end timing determined according to the power measured by a measuring unit, the measuring unit being configured to measure the power supplied to the plurality of heat generating elements;
• set an average of a cycle for supplying the power to a first average cycle, in a case of causing the first color developing portion to develop the first color, the cycle corresponding to a time from a rising edge to a next rising edge of the supplied power;
• and
• set an average of a cycle for supplying the power to a second average cycle longer than the first average cycle, in a case of causing the second color developing portion to develop the second color, the cycle corresponding to a time from a rising edge to a next rising edge of the supplied power.