Radiation is also minimized by low emissivity (highly reflective) surfaces.

This is "naturally" low thermal emissivity, found in some formulations of borosilicate or Pyrex.

Radiant barrier materials must have low emissivity (usually 0.1 or less) at the wavelengths at which they are expected to function.

Though, it is possible to create visibly dark colored surfaces with low thermal emissivity.

Windows glass can be coated to achieve low emissivity or "low-e".

A major consideration is the low emissivity of yttria, which limits background radiation upon heating.

Most liquid (melted) metals are silvery, which is high reflectivity and low emissivity, so they try not to radiate much of any color.

This type of theoretical model, with frequency-independent emissivity lower than that of a perfect black body, is often known as a "gray body".

Radiation is also minimized by low emissivity (highly reflective) exterior surfaces such as aluminum foil.

A source with lower emissivity independent of frequency often is referred to as a gray body.