abstract |
A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one phenoxazine compound represented by the formula WHEREIN R1, R2, R3, R4 and Y are as defined hereinafter, is disclosed. |