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Katy Duncan 🍉 @katysduncan.bsky.social · 17/07/2025

I had so much fun at The Royal Society’s Summer Exhibition a few weeks ago! The quantum tech room was especially cool. Is the historian-equivalent of touching grass *actually talking* to living scientists? Maybe. Obviously stopped by Faraday’s colloids that @ri-science.bsky.social loaned too… 🧪

Katy is standing by a poster board that explains Faraday’s gold colloids, and talks about how he presented them at a Discourse (lecture) in 1856. They are possibly the oldest active colloids in existence.

Close up of the gold colloids made by Faraday, including a wooden box with a prism on top, and two small bottles. One is a third full of a pale pink colloidal solution, and the one in the background is half full with a deeper transparent pink solution. They remain optically active, but their exact composition is unknown.

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