Steps:
1. Eggshells are dissolved in HCl.
2. Ethyl acetate is used to extract protoporphyrin.
3. Top layer containing protoporphyrin is separated (optionally you can filter the solution before separation).
4. Protoporphyrin solution glows red in UV chamber.

More info:
PL weirdscience.eu/Ab ovo.html#[5_]
ENG uwaterloo.ca/chem13-news-magazine/april-2014/feature/egg-cellent-little-demo-spring

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