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Happy #Halloween! Forget tricks, here's a treat in the form of a short thread of halloween chemistry... 🧵 
First up, pumpkins! Carotenes give pumpkins their orange colour, and various aroma compounds contribute to the vegetal smell as you carve them, as this graphic in @cenmag details: cen.acs.org/articles/93/i4…
Did you know pumpkin seeds also contain a compound that fluoresces if extracted? Crushing them with nail varnish remover gives an extract that glows red-orange in UV light, thanks to the chlorophyll precursor protochlorophyllide 🎃
