Since there is a temperature-sensitive chemical on the paper surface of the carbon paper, the Carbonless Paper will be discolored after receiving the high temperature, and it will turn black. When the tip of the pen passes, it will instantly generate high temperature due to friction, so it will turn black wherever the notes go. If you try to use a lighter to bake directly, you will find a discoloration moment on the Carbonless Paper.
Since there is a temperature-sensitive chemical on the paper surface of the carbon paper, the Carbonless Paper will be discolored after receiving the high temperature, and it will turn black. When the tip of the pen passes, it will instantly generate high temperature due to friction, so it will turn black wherever the notes go. If you try to use a lighter to bake directly, you will find a discoloration moment on the Carbonless Paper.