  A study on the radiative properties of two pure metals, copper and nickel,
using a high accuracy radiometer is carried out. Their spectral emissivity
between 3 and 21 {\mu}m and its dependence on emission angle and temperature
between 250 and 900 $^{\circ}$C is measured. An evolution of the samples
emissivity associated to the surface stress relaxation is observed, which is
relieved after two or three heating cycles. Spectral emissivity of metals
usually decreases as wavelength increases, but in the case of copper an
irregular behaviour has been found. Its spectral emissivity shows a broad
plateau around 10 {\mu}m, which can be due to the anomalous skin effect. On the
other hand, the emissivity usually increases with temperature, but in the case
of nickel the emissivity changes little and even slightly decreases for T > 700
$^{\circ}$C. The exper-imental directional emissivity of both metals shows the
dependence on the emission angle predicted by the electromagnetic theory for
metallic samples. By increasing the emission angle, the emissivity dependence
on the wavelength strongly decreases. Furthermore, in the case of nickel, an
emissivity increase with wavelength is observed for k > 20 {\mu}m. The
electrical resistivity for both metals is obtained by fitting the experimental
emissivity curves with the Hagen Rubens equation. The results agree fairly well
with direct electrical resistivity measurements for copper but show a poor
agreement in the case of nickel.
