Chrome tanned crust leathers were treated with atmospheric pressure plasma with argon flows at different times. The leather was then dyed with acid and metal complex dyes. The dyestuff concentration in the exhausted dye bath, CIE lab color analysis, hydrophilicity, FTIR spectra and SEM images were compared for 0, 2.1, 4.2 and 6.4 sec/cm(2) durations of plasma. In addition, various physical properties such as rubbing fastness, tear loading and tensile strength were also examined to see the effects of increased duration of the plasma process. The presence of ions that appeared during this process in an atmospheric environment was determined by OES. The best results were obtained from leather subjected to 6.4 sec/cm(2) of argon gas atmospheric pressure plasma.