A low cost method of detecting surface breaking flaws, such as cracks, cold laps, porosity etc. The dye penetrant is drawn into the surface breaking flaw by capillary action and excess surface penetrant is then removed; a developer is then applied to the surface, to draw out the penetrant in the crack and produce a surface indication. The technique can be applied to any non-porous clean material, metallic or non-metallic.

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