Which compound or compounds are responsible for color change in blue butterfly pea flower tea?

[Blue Butterfly Pea flower tea](https://www.bonappetit.com/drinks/non-alcoholic/article/butterfly-pea-flower-color-changing-tea) is blue by default. Add citrus juice and it turns purple. What compound or compounds are responsible for this reaction to change in pH?


[Wikipedia](https://en.wikipedia.org/wiki/Clitoria_ternatea) doesn't say, nor can I find any source on the internet that does.




OK, that was simple. This


<https://www.google.de/search?q=Clitoria+Ternatea+blue+color>


gave this


<https://www.ncbi.nlm.nih.gov/pubmed/14568080> 


which lead me to this


<https://en.wikipedia.org/wiki/Anthocyanidin>


and I guess that's the culprit. I judge from that abstract linked above that the actual plant can contain a wide mixture of those anthocyanidines.


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