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为什么购物小票遇热变黑？
简单的摘要：购物小票遇热变黑的原因主要是热敏纸的特性、化学反应以及温度的影响。
1、热敏纸的特性：购物小票通常使用热敏纸打印，这种纸表面涂有一层热敏涂层，其中的无色染料在受到热量时会发生变化。
2、化学反应：当热敏纸遇到热量时，涂层中的染料与显色剂发生化学反应，导致染料显色，从而在纸上形成黑色的印迹。
3、温度的影响：热敏纸对温度非常敏感，即使在较低的温度下（如50-60摄氏度）也会发生颜色变化。因此，当购物小票接触到热源，如阳光直射、高温物体等，就会变黑。
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