| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain an ink composition capable of confirming heat treatment at relatively low temperature of about 50 deg.C, and provide a confirming method. SOLUTION: This ink composition comprises at least one kind of dye selected from the group comprising a triphenylmethane-based dye, a monoazo-based dye and a xanthene-bated dye, a resol type phenol resin and an amine salt whose anion is tetraphenylboron ion or a quaternary ammonium salt and a solvent capable of dissolving the dye, the resin and the amine salt or the quaternary ammonium salt, and changes the color by heating.</p> |
