Why does a dark can filled with boiling water radiate heat faster than a shiny can filled with boiling water?

A dark can absorbs and radiates heat more effectively than a shiny can due to its color and surface properties. Dark surfaces have a higher emissivity, meaning they can emit thermal radiation more efficiently. In contrast, shiny surfaces reflect more radiation and have lower emissivity, which reduces their ability to radiate heat. As a result, the dark can will lose heat faster than the shiny can when both are filled with boiling water.