“Why does the black keep beverages hot for 7 hrs and the blue for 9 hours? Aren't they the same product with only color differences?”

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• It's a good question and Skywalker's answer makes no sense.

  Answered by Camshaft 5 years ago

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• The black takes in heat, as for the blue takes in less heat, hence the difference.

  Answered by Skywalker 5 years ago

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