We'd like to cover our french drain with a layer of decorative gravel. Came across these black polished cobbles: https://www.midland-stone.com/uk/product/decorative-stones/polished-pebble-cobbles/black-polished-cobbles/
I got a sample and they look nice, although I had to rinse them to get some dust off them which I assume must have been caused in transit as the pebbles bashed each other. Not sure.
One thing that made we wonder was the part of the description that says: "Over time, due to natural weathering, the pebbles will lose some of the high polish and become more matt in appearance." Why is that the case? The only weathering is rainwater really an dpossibly some UV damage. Does this imply that these pebbles are not polished and are in fact varnished?