Has any one noticed that it changes colour to blue when diluted ?
Presumably it can be used a pH (acid/alkali) indicator.
What is the name of the red dye in blackberry juice?
It is an anthocyanin, it is an acid base indicator. The blue color would be from the alkaline tap water. It would be called a pigment, not dye. It is responsible for the reds, blues and purples in flowers and fruits and leaves.
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