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