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Which of the following types of light is preferred for using fluorescent penetrant in liquid penetrant testing (LPT) method?

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in Casting-Forming-Welding I by (687k points)
Which of the following types of light is preferred for using fluorescent penetrant in liquid penetrant testing (LPT) method?

(a) Normal light

(b) Monochromatic light

(c) Ultraviolet light

(d) Red light

This question was addressed to me at a job interview.

The doubt is from Inspection and Testing topic in portion Inspection Testing in Foundries of Casting-Forming-Welding I

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Right answer is (c) Ultraviolet light

The explanation is: In LPT method, the objective is accomplished by entrapment of the inspection liquid by the flaws followed by visual inspection of the surface under ultraviolet light (when using a fluorescent penetrant) and for visible dye penetrant, normal light can be used for the inspection process.

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