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Penetrants of which colour are not used?

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in Casting-Forming-Welding II by (119k points)
Penetrants of which colour are not used?

(a) Red

(b) Blue

(c) Green

(d) Yellow

The question was asked in a national level competition.

The above asked question is from Dye Penetrant Test topic in division Non Destructive Techniques of Casting-Forming-Welding II

1 Answer

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Best answer
The correct choice is (a) Red

To elaborate: The application of penetrant is one of the steps of inspection of dye penetrant test. It is an important feature that one must take care of, that the penetrant used, must not be of red colour, as defects are identified using red colour.

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