Hello, black goji berries soak in water whether blue or purple is a normal reaction, do not because of the different colors in the cup and have trouble.

Note: black goji berries color is very strong, soaked in tap water (acidic water) in blue, in mineral water (alkaline water) in purple.

The color of black goji berries in water does not affect the absorption of nutritional value, but the temperature of the water must be moderate, 50 degrees Celsius is good, or with cold water, so as to play the best effect.