{HEAD ~ The co presence} of a phenol derivative represented by chemical formula 1 and a diphenyl sulfone derivative represented by chemical formula 2 in the thermosensitive color developing layer is presumed to support {TAIL ~ the well balanced performance} by increasing the stability of the electron transfer complex that is the reaction product of a color developing agent and a basic dye 
{ HEAD ~ The co presence } of a phenol derivative represented by chemical formula 1 and a diphenyl sulfone derivative represented by chemical formula 2 in the thermosensitive color developing layer is presumed to support { TAIL ~ the well balanced performance } by increasing the stability of the electron transfer complex that is the reaction product of a color developing agent and a basic dye
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