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Greatgiftlab

Temperature Changing Christmas Card

Temperature Changing Christmas Card

Regular price £9.90 GBP
Regular price £20.00 GBP Sale price £9.90 GBP
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  • The hidden pattern will appear when the temperature exceeds 36°C.
  • The greeting card can be reused, and it will gradually return to its original state within about 20 seconds.
  • Usage scenarios: The pattern works well with temperature differences generated by devices such as space heaters, hairdryers, lighters, etc.
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