Anthracite grey takes its name from anthracite coal — the hardest and purest form of coal, characterised by its deep, near-black tone with faint warm or cool undertones depending on the light. In the RAL colour system, RAL 7016 is the official reference for anthracite grey, placing it at the darker end of the grey spectrum without tipping into true black. It is a nuanced shade — sophisticated, architectural, and remarkably adaptable — which goes a long way to explaining why it has become the most requested colour for uPVC windows and doors across the UK property market over the past decade.