All natural stones will fade over time when exposed to the UK climate and Indian sandstone is no exception. Sandstone will slowly fade over the years losing some of the vibrance of the original colour but if regularly maintained will keep its original colour for many years without any visible change to the surface of the stone.
We recommend undertaking regular maintenance to keep your patio looking at its best, but at the same time let nature take its course and enjoy the process of weathering that all natural stone goes through.