Which risk increased for early Bronze Age smiths when arsenic levels varied in copper ores?

💡 Explanation

When arsenic levels varied in copper ores, inconsistent arsenic bronze composition occurred because the incomplete control over smelting resulted in high concentration fluctuations exposure. Therefore the risk of arsenic fume toxicity increased, rather than brittleness, fuel efficiency loss, or excess inclusions, which would stem from issues respectively in antimony bronze alloy creation, furnace design or deoxidation practices.

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