US Patent 10368695 Vessels for processing and storage of foodstuffs

A combination of a container in which foodstuffs are to be prepared and stored, and an electrically powered food-processing appliance, wherein at least a portion of the container includes material responsive to electrical energy applied thereto to vary the transmission of light therethrough. The appliance is configured for selectively applying electrical energy to the material, whereby at least said portion of said container is selectively rendered more transmissive to light.