Dear David, I strongly echo your comments...
> ... marble is not favoured for exterior stone > work in UK... black/dark slate with a matt finish > gives a very good surface for shadows. Slate is my favourite stone for sundials and it is astonishing how clear the shadows are. Oolitic limestone is next best since it has a nice matt finish too. Marble I think is hopeless, especially in the UK. Stainless steel is even more hopeless if left in mirror condition. Everything Tony Moss says about stainless steel is right but it sounds very hard work to me! Best wishes Frank King --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
