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Liquid penetrant testing involves the application of a fluid with low viscosity to the material to be tested. This fluid seeps into any defects such as cracks or porosity before a developer is applied which allows the penetrant liquid to seep upwards and create a visible indication of the flaw. Penetrant testing can be performed on magnetic and non-magnetic materials but does not work well on porous materials. Surface being tested is clean and free of any foreign materials or liquids that might block the penetrant from entering voids Liquid penetrant tests can be conducted using solvent removable penetrants, water washable penetrants or post-emulsifiable penetrants. Penetrants may be “visible”, meaning they can be seen in ambient light, or fluorescent, requiring the use of a “black” light.