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The materials that would float in a molten vat of lead are glass and charcoal.
Glass and charcoal are the materials that would float in a molten vat of lead because they are less denser than the lead solution while on the other hand, platinum and gold get drowned into the solution because of its high density as compared to lead.
So we can conclude that the materials that would float in a molten vat of lead are glass and charcoal.
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