White marble has been used in the past for many purposes, but its composition is, however, easily attacked by pollution products like sulfur dioxide, undergoing transformation into gypsum. Deterioration proceeds very fast, and important works of art undergo degradation. Presented are the results of treatment by silanes as well as observations on the aging of this marble. Due to the satisfactory behavior of the marble after treatment, it seems that silanes can be considered suitable for preservation purposes of ancient works of art.