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The uncoated steel sheet before tinplating is known as ________

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The uncoated steel sheet before tinplating is known as ________

(a) steelplate

(b) bareplate

(c) blackplate

(d) foreplate

I got this question in an interview.

My question is based upon Manufacture of Tinplate topic in portion Metal Packaging Materials of Food Packaging Technology

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Right option is (c) blackplate

To explain: The uncoated steel sheet before tinplating is referred to as blackplate, thus called because some of the early production was covered with black iron oxide. It is the raw material for electrolytic tinplate (ETP) and ECCS.

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