How do you measure the emittance of infrared by different surfaces?

First, fill the Leslie’s cube with hot water. Then point an infrared detector at each of the four surfaces. Record the amount of infrared emitted. The distance between the Leslie’s cube and the infrared detector should be kept the same. This ensures a repeatable measurement. At the end, the infrared practical will show the matt black surface emits the most radiation. The shiny black surface and the white surface emitted less radiation. While the shiny metallic surface emitted the least infrared radiation.