Assertion: penrhyn heather blue slate | /r/CapableOf | achieve the highest grade
Facets:
Source sentences:
text: The Penrhyn Heather Blue slate, aka Bangor Blue, has a heather blue or purple colour and achieves the highest grade in the British Standards (BS) EN 12326 –
text: Penrhyn Heather Blue slate achieves the highest grade in the British Standards (BS) EN 12326 –