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What specific physical problem did ancient Indian metallurgists have to solve to successfully smelt zinc at scale?

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1. What specific physical problem did ancient Indian metallurgists have to solve to successfully smelt zinc at scale?

Zinc’s low boiling point, which caused it to vaporise before it could be collected using ordinary methods

Zinc’s extreme hardness, which made it impossible to melt at all

Zinc’s magnetic properties interfering with furnace tools

Zinc’s radioactivity, requiring special handling equipment

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