CHECKER FOR SECURITY AND SECURITY MAINTAINING METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a new checker for security by special paint and a security maintaining method using the checker. SOLUTION: A small particle piece 213 for password in a specified shape, which is colored and visible when the piece is irradiated with ultraviolet ray and is decolored and hidden when it is not irradiated is mixed in paint 1 which emits light when irradiated with ultraviolet ray and is decolored and hidden when it is not irradiated so that the piece can be visible/hidden.