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Let the bottle flip when you start making tea, Bottle's body is double layer design, the outer layer of glass paint with blue discolor paint , when the hot water pour into the bottle, the water's heat will be transmitted to the outer layer from the inner glass, let the outer glass which have paint with discolor paint, gradually turned from blue to transparent because contact to heat. Discoloration time is about 5 minutes. When people see the bottle discoloration, on behalf of the tea you can drink, and then flip back to the bottle and let the tea no longer in contact with the hot water, causing the quality of tea damage.