| 摘要 |
PURPOSE:To heighten the color tones and brightness of defect indicating patterns, by jointly using a capillary method and a diffusion method by adding a plasticizer, which is liquid at the normal temperature, to a quick-drying develop consisting of white impalpable powder and a volatile solvent. CONSTITUTION:White impalpable powder 4 and a plasticizer 5, which is liquid at the normal temperature, are dispersed and dissolved in a volatile solvent that is chemically stable to the impalpable powder 4, dissolves the plasticizer 5 and the speed of evaporation is rapid to some extent. When the developer is applied on a surface 1 that flaws are detected thinly and uniformly, the volatile solvent volatilizes, and developing coating films 6 that the plasticizer 5 is held between the surface 1 and the impalpable powder 4 are formed. A permeation liquid 3 remaining in a defect 2 opening to the surface 1 is sucked up by the capillary action and diffusion action of the coating films 6, and defect indicating patterns 7 magnified are made up. Thus, the extension of the patterns 7 is little even when time elapses, and whiteness as backgrounds is sufficiently maintained even when the coating films 6 are thin. |
