Glass Grape

20
Apr/08
0

Why does soda fizz of purple grape that starts, then turns blue?

When you pour grape soda in a glass with ice in it, the excitement turns from purple to blue after some time. Why? What is the science behind it?

I do not know - but I can guess: [1] could turn the oxidation of the pigment in darker purple drink in a blue color:. [2], it might be dilution of the pigment by melting ice [3], it could be a change in pH as CO2 sparkles on the beverage, the pH increase (more and less acidic), plant pigments change color pH dependent.

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