Colloidal silver, a suspension of very small nanoparticles of silver metal, has found widespread use as a popular home remedy for a range of ailments.

https://www.universal-sci.com/headlines/2019/6/13/silver-makes-beautiful-bling-but-its-also-good-for-keeping-the-bacterial-bugs-away

The Phoenicians lined clay vessels with silver to preserve liquids (around 1300BCE), the Persians and Greeks used silver containers to store drinking water (around 5000-300BCE) and Americans travelling west during the 1880s added silver coins into water barrels.

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