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https://www.berrycells.com/how-to-make-a-berry-cell
According to professor Michael Grätzel the best "berry" to use for this kind of demonstrator cells is hibiscus tea (known as karkadè in Arabic).
- https://en.wikipedia.org/wiki/Hibiscus_tea
- https://en.wikipedia.org/wiki/Roselle_(plant) Hibiscus sabdariffa