To obtain a heat-ray-nonabsorbent coloring compsn. which enables a molded article to be colored black or deeply and to be heat-ray-nonabsorbent by incorporating a metal semiconductor powder such as a silicon powder into the same.

This coloring compsn. contains a metal semiconductor powder as a pigment. Powders of silicon, germanium, gallium-arsenic, gallium-aluminum- arsenic, etc., are listed as the metal semiconductor powders. Light with energy higher than the band gap, 0.8-1.5 eV, of these metal semiconductors is completely absorbed, though light with a lower energy is not absorbed. Silicon, having a band gap of 1.1 eV, does not absorb light with a wavelength corresponding to the band gap, i.e., 1100 nm, or higher while absorbing visible light only and hence looks black. The reflectance of heat rays can be increased by increasing the amt. of metal semiconductor particles compounded, and the transmittance of heat rays can be increased by decreasing the particle size and film thickness. The coloring compsn. can be used in resin compsns., coating compsns., oil or fat compsns., etc.