We have to turn to science to break it down: The butterfly pea flower contains anthocyanins, which are the natural pigments ...

Butterfly pea flower tea also comes in an extract form, which you can buy on Amazon—Isle uses B'lure. This allows you to change the color of drinks like the French 75 , which Isle loves.

Butterfly pea, a unique natural colouring agent, delivers vibrant purple shades in applications with a pH of 4.0 or below and bold blue hues in applications with a pH above 4.0.

This color-changing blue butterfly pea flower mocktail is floral, fresh, and totally booze-free. ... and then add the tonic water to see the drink turn into a gorgeous deep purple hue. ...