Which of the following metals must be tested with low halogen sulphur free penetrant materials:

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Q. Which of the following metals must be tested with low halogen sulphur free penetrant materials:

(A) Copper, silver, gold
(B) Nickel based alloys, certain stainless steel materials
(C) Steel, iron, aluminium
(D) Plastic, wood, paper

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✅ Correct Answer: (D) Plastic, wood, paper

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