This paper presented the possibility to obtain the structural information using the colour contrast method for an eutectic aluminium alloy Al 12 SiCuMgNi. The colour metallography of aluminium alloys represents a novelty in the area of aluminium alloys and improves the results obtained by optical metallographic microscopy concerning the internal structure of metals and alloys. This technique provides information on the structure and makes it possible to clarify the information on the structure in comparison with the black and white images. Also it allows to evaluation the individual types of phases in aluminium alloys, the identification of undissolved particles of metals (Zn, Si, Pb, etc), and evaluation of the quality of homogenizing, colour differentiation of the individual types of inclusions in aluminium alloys. The colour metallography results are correlated with the information obtained by means of TEM and XDR techniques. The photographs produced in a transmission microscope show the foreign particles and XDR analysis confirms that these foreign particles are based on silicon, Al-Ni-Fe-Mn and Al-Fe-Mn-Si. In this case, the colour contrast method allows the identification the aluminium alloy individual phases, identification nondissolved metal or master alloys particles like Si, identification the Fe particles penetrate during forming processes and colour distinguishing individual particles presented in aluminium alloy.