From nail bars to firefighting foams: how chemicals are deemed safe enough or too harmful

By Mark Lorch, Professor of Science Communication and Chemistry, University of Hull

If you’ve sat in a nail salon recently, you may well have encountered TPO or trimethylbenzoyl diphenylphosphine oxide to give it its full chemical name. You won’t have seen the name on the bottle. But if you’ve had your gelled fingers under a blue-violet lamp, TPO could well have been part of the process.

TPO is what chemists call a photoinitiator – basically, a chemical that reacts when it’s hit with UV light. When your nails go under the lamp, TPO breaks apart and helps link tiny liquid molecules together, turning the polish into that solid, shiny, long-lasting gel layer.

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