In this study, white tuff samples at the tuff quarries located at the Eskisehir/Derbent region in Turkey were treated with lime-water bath to determine the slake durability index. Firstly, Equal-sized spherical samples are prepared according to the new method, Pasha Method. Then, slake durability index tests have been applied on spherical samples kept for 7-day in lime-water bath. The second cycle index values of spherical samples subjected to lime-water bath have been compared with the index values of original spherical samples. Although the index values of original spherical samples were found as 94.89-95.56 %, the index values of spherical sample sets treated with lime-water bath were found to be in 95.02 and 96,64 %, respectively. According to the results of this study, it can be concluded that lime-water treatment has no effect on enhancement of the slake durability index values of spherical samples when compared to those of spherical samples with no treatment.