| 摘要 |
PROBLEM TO BE SOLVED: To provide a special back carbon ink, and a pressure-sensitive copying sheet excellent in copy performance and tamperproof effect using the same. SOLUTION: The back carbon ink comprises a coloring material, wax, oil, and surfactant or the like, and is characterized by having melting point of 60-100 deg.C. The tamperproof pressure-sensitive copying sheet preparing a coating layer of this back carbon ink is provided. |
