This simple and clever can automatically indicates its current state , if it’s full or empty.
When it is empty the can shows an OFF message but when you pur hot coffee or tea inside it gradually transforms to ON. A heat sensitive pigment changes the color of the can from black to white.
This unique mug for coffee, “Soupe du Jour”, can be bought for $25 from Charles & Marie.
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Coffee Can? or Mug?