Villamayor sandstone (also known as "golden sandstone") has been widely used for construction in the city of Salamanca since Roman times. In the present study, the four most characteristic varieties of this material were used, considering the chromatic changes brought about by consolidation and/or waterproofing treatments and by cycles of artificial ageing of natural stone and of stone subjected to these treatments. The treatments consisted of application of a consolidant at different concentrations (RC 70 and 40% RC 70) and two consolidants plus waterproofing agents (RC SO and RC 90). Artificial ageing was induced by 10 cycles of wetting drying and freezing/thawing. The chromatic variations observed considering the E*, L*, a*, and b* parameters were subjected to statistical analysis.