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Excess penetrant must be removed from the crack opening and the surface of the sample while removing as little penetrant as possible from the crack/defect.They are specific solvents for specific penetrants as one penetrant dissolves in one type of solvent and vice versa.Treating the part with emulsifier and rinsing with solvent are among the steps carried out for removal.
Developer is used to draw trapped penetrant in flaws back to the surface.Developers are produced in both dry and wet form. Dry powders are dusted or liquid developers are sprayed on the crack opening surface.Developers are used to draw penetrant out from the crack, to increase its visibility with distinctive properties and good visual colours.