Dual purpose penetrant system

Details Dual purpose penetrant system Dual purpose penetrant system

G - Physics

01

B

73/178, 150/4

G01B 11/30 (2006.01) G01N 21/91 (2006.01)

Patent

CA 1143635

ABSTRACT Method and composition for detecting flaws in a workpiece utilizing either white light or ultraviolet light wherein a penetrant solution is applied to the surface of the workpiece, the penetrant solution con- taining a rhodamine dye dissolved in solvent, the dye possessing an inherent color and being capable of fluores- ing under the influence of ultraviolet light. The excess penetrant is removed from the surface in accordance with usual practice, while leaving penetrant entrapped in any surface flaws. An improved developer is applied to the surface, the developer consisting of a suspension in- cluding a finely divided developer powder suspended in the same dye solvent as in the penetrant in a sufficient amount to lower the concentration of rhodamine dye in the entrap- ped penetrant below that at which quenching of fluorescence occurs. The indications thus produced under both visible light and ultraviolet light are distinct and non-blurring, enabling the piece to be inspected under either type of light source.

356749

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