摘要:
A residue remaining on an object to be cleaned after cleaning is easily detected and observed on the object. Adhesive materials 2A and 2B for use in residue confirmation, which are applied in advance to an object 1 to be cleaned for confirmation of a residue remaining on the object 1 after cleaning, are formed by coloring chips produced during cutting work. The adhesive materials 2A and 2B are preferably formed by coating and coloring the chips with paint, the paint emitting visible light in an excited state.