The darker hues of course will be the higher-quality slates, although not all dark shades have the desired qualities, so you must test and pick carefully.
Some slate slabs are fragile. Low-quality tiles can be extremely permeable, making it difficult to seal and stain quickly.
This variety will readily crumble, flake, chip, scratch, and etch (chalky dull areas) from acidic meals and most
cleaning solutions.