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GK Fanatic | 14:07 Sat 12th Aug 2006 | Quizzes & Puzzles
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47d Scum of oxidised materail on the surface of molten metal (4) ?L?G
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slag
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Thanks, I thought that slag just referred to coal leftovers !!!
Yes that was my first thought, but I found the following under Answers.com ............ ''during smelting slag floats to the surface of the molten metal ...........'' , so we should be ok with it.

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