Desensitizable self-contained record material useful for security documents and the like

摘要: An improved self-contained record material having tamper resistance through an indicator quality is disclosed. The of the invention suitable for forming a visible mark with focussed means pressure application such as stylus, needle, or pen and which can then later be in part fixed by unfocussed light. comprises substrate on coated two sets microcapsules only one made photosensitive to change viscosity upon exposure actinic radiation, first are conventional microcapsules. color formers each selected express different observed color. Original markings, example, could black (combination orange blue formers). After radiation desensitizing former containing capsules, subsequent markings indicating aspect subsequence time.