| 摘要 |
<p>PURPOSE:To make it easy to delete marker for removing unnecessary markers after business transaction so as to avoid bad appearance by providing marker consisting of color deleting toner on a specific position of a sheet so as to make a recording sheet. CONSTITUTION:A marker is provided at a specific position on a sheet by using color deleting toner consisting of a composition containing color deleting pigment and binding resin and utilizing a copying machine. The color deleting pigment to be used has color in a state that light having a specific wavelength is not jetted thereon. When the light is jetted on the pigment under existence of salt of compound as a counter ion, it is adsorbed and becomes transparent as a deleted color. As the color deleting pigment, blue color deleting pigment is suitable, and particularly cyanine dye is suitable. When the cyanine dye is used, salt of organic boron compound is to be provided in order to give color deleting function. As the binding resin, polystyrene, polystyrene-butadiene copolymer will be suitable.</p> |
