The safety record says elemental copper dust is an irritant outside very large doses and acute toxicity happens at levels above a gram. Copper is already every

The safety record says elemental copper dust is an irritant outside very large doses and acute toxicity happens at levels above a gram. Copper is already everywhere at levels far, far above PFAS. It is found naturally in all plants and animals and it has been used for everything from coinage to water pipes for upwards of six millennia.