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The drink doesn't have to be alkaline, as butterfly pea blossom retains its blue color between a pH of 4-8. The only thing required is to prevent the drink from dropping below that, which lemon juice can do (or a non-homogeneous mixture, for that matter).


This question helps, from it, we learn that 1/2 cup table sugar + 1/2 cup water results in a volume of 3/4 cup. The second answer claims that 2 cups of sugar + 2 cups of water equals a total volume of 3 and 1/8 cup. Slightly different from the first response, but in the ball park. I will assume that the combination of instant coffee and water leads to a ...

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