In this live video we prepared and tested a brewed cup of tea and measured the caffeine in the brewed cup of tea at 0.173 mg/g, which was well aligned with results from the scientific literature, see below. We then also tested a can of Red Bull which has 0.03 % caffeine, and showed that we had 0.313 mg/g of caffeine, demonstrating the accuracy of the FSG4 for measuring caffeine in tea beverages.
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