In this study, it is aimed to find out usability of collagen hydrolysate along with oxazolidine in retanning process to achieve an enhanced over all strength and fullness properties of leathers and to reuse hazardous chromed shaving wastes from leather industry as well. Those wastes were hydrolyzed with commercial enzyme preparation in an alkali medium. This collagen hydrolysate was used along with oxazolidine in retanning process. Strength and fullness properties of leathers were evaluated alter applying varying ratios of collagen hydrolysates (7.5-10.0-12.5-15.0 %) along with oxazolidines (4-6-8%). As a result it is determined that all applied combinations had enhanced expected properties of leather. The highest strength and fullness properties were found to be achieved in the samples which were processed with the combination of 15 % hydrolysate and 6 % oxazolidine.