| 摘要 |
PROBLEM TO BE SOLVED: To decrease see-through efficiency of an upper paper by combining a sheet having microcapsules enclosing a coloring agent and a layer containing a colored substance set on a supporting body, and a sheet having a layer containing a developer generating color in reaction to the coloring agent set on a supporting body so that the coloring agent layer confronts the developer layer. SOLUTION: A first sheet having microcapsules enclosing an electron-donating organic coloring agent and a layer containing a colored substance set on a supporting body, and a second sheet having a layer containing a developer generating color in reaction to the coloring agent set on a supporting body are combined so that the coloring agent layer confronts the developer layer. The coloring agent enclosed in the microcapsules is a known substance in fields of pressure-sensitive copy papers or heat-sensitive recording bodies, and generally capsuled in a state to be dissolved in oil. The developer is an aromatic carboxylic acid or its multivalent metallic salt. Coloration efficiency is not deteriorated and records of a lower paper, etc., cannot be read from above an upper paper. |
