Anthracite Grey or Agate Grey

Is Anthracite Grey or Agate Grey better for sliding sash windows?

The last few years Anthracite Grey has been a very popular colour but now our Agate Grey is available as a standard foil with white on the inside we have seen a sharp increase in the use of Agate Grey, as you can see by the photos installed by McDermott Windows these could be best seller very soon!