Wikipedia: "The Mall in central London is the road running from Buckingham Palace at its western end to Admiralty Arch and on to Trafalgar Square at its eastern end. It then crosses Spring Gardens, which was where the Metropolitan Board of Works and, for a number of years, the London County Council were based. It is closed to traffic on Sundays and public holidays, and on ceremonial occasions. The surface of The Mall is coloured red which gives the effect of a giant red carpet leading up to Buckingham Palace. This colour was obtained using synthetic iron oxide pigment from The Deanshanger Oxide Works (Deanox), [1] which was created using The Deanox Process devised by head chemist Ernest Lovell (b. London 1917). It was MP David Eccles' decision, as minister of works, to make the Mall red."
