AGENT FOR DETECTING FLAW ON SURFACE OF POROUS SUBSTANCE

PROBLEM TO BE SOLVED: To provide an agent for detecting a flaw on a surface of a porous substance, for use in a method for detecting a crack in the surface of a porous substance such as concrete, designed to improve removal from the inspection surface in post-processing after inspection, to reduce the cost of maintaining the appearance and cleanliness of the inspection object and the cost of processing detergent drain, and to reduce the environmental impacts of discharge of excessive flaw-detecting agent and drainage having flowed out of the surface during inspection and scattering of colored particles into an area around the inspection site. SOLUTION: An agent for detecting a flaw on the surface contains sodium hydrogen carbonate (hereinafter referred to as "baking soda") particles, which has no environmental load even when discharged into the natural environment, as a dispersed substance, thereby keeping the cleanliness of an area around the inspection site and of the inspection object after inspection. The particles per se or an aqueous solution that remains after the particles has been washed away with water can be discharged without processing. COPYRIGHT: (C)2011,JPO&INPIT