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Purple staining is related to a defect in which packaging?

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+1 vote
in Food Packaging Technology by (63.0k points)
Purple staining is related to a defect in which packaging?

(a) PET bottles

(b) Glass bottles

(c) Metal cans

(d) Paperboard

The question was posed to me in an online quiz.

The origin of the question is Food Packaging Materials in chapter Food Packaging Materials, Packaging Standards and Regulation Laws of Food Packaging Technology

1 Answer

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Best answer
Right choice is (c) Metal cans

Best explanation: Purple staining is observed in metal cans. This defect refers to the blackening of inner side of can. It occurs when sulphur containing food reacts with iron in the can to form purple iron sulphide.

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