| 摘要 |
An acid-base type recording material which forms an image by utilizing a color-forming phenomenon caused by the interaction between a basic leuco dye and an acidic color developer, wherein the acidic color developer is composed of a major component (1) comprising a solid acid which is derived from a clay mineral having a laminar structure comprising tetrahedral silica, which shows an electron beam diffraction pattern based on the laminar structure comprising the tetrahedral silica but does not substantially show the above described laminar structure in an X-ray diffraction pattern, and which contains at least silicon and magnesium and/or aluminum as elements other than oxygen and a subsidiary component (2) comprising a polyvalent metal salt of a salicylic acid derivative and, if desired, a metal compound. This material forms color images with a remarkably improved fastness. |
