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Double walled glass cup with black glass marbles and water.

The black glass marbles retain heat and warm the surrounding water faster.

This photo shows the water is 90% which is pasteurised. 

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current08:53, April 16, 2016Thumbnail for version as of 08:53, April 16, 20161,458 × 2,313 (1.35 MB)Hdawsond (Talk | contribs)


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