<human>: Which of the following solutions is better for the following goal:
How to paint the box for a solar air heater?

OPTIONS:
- Paint the box either black or any dark shade so that the heat is absorbed and trapped within the box for efficient heating.
- Paint the box in silver color on both the exterior and interior so that their is a feedback cycle of heating happening within the box.
<bot>: Paint the box either black or any dark shade so that the heat is absorbed and trapped within the box for efficient heating.