I boiled up 1/2 cup of flowers with 1 cup of water and let it steep for a while then collected the dark blue liquid and added some neutral to it so it would keep.
It's edible and also changes to pink color in low pH.
I added a very small amount to a batch of Odin's Easy Gin to make it light blue colored without affecting the taste. When you pour in the tonic it changes from blue to pink. It's really cool.
You can find the flowers on amazon.
Fun with butterfly pea flower
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