I also found it interesting to read in Wikipedia about hibiscus. It's strange that I did not think about it.
Especially since I asked a question about how to make tea from it.
After reading, I had a question: and who has high acidity (I do not have it), can they drink such tea?
Because write in Wikipedia:
"Hibiscus tea contains 15-30% organic acids, including citric acid, malic acid, and tartaric acid."
Your link was useful for me, thank you from me.