INK COMPOSITION, RECORDING METHOD AND RECORD, AND METHOD FOR JUDGING AUTHENTICITY

摘要

PROBLEM TO BE SOLVED: To provide a technique for producing a technique at a low cost which enables a general user to easily judge the authenticity of a record; and a technique which enables an appraiser to judge the authenticity of a record even when the record is an imitation. SOLUTION: Characters or images for judging authenticity are recorded by an ink jet recording method of a hot-melt type using an ink composition of which the color changes with the observation angle to light. The authenticity is judged by basing upon the consecutive lot number and corresponding data on its print position.