English: A substantial industrial complex, in its time one of the largest chemical works in Scotland. Construction began in 1866. Addiewell remained the centre of operations for Young's Paraffin Light and Mineral Oil Co. Ltd, but as local supplies of shale became exhausted, activities were increasingly focussed on shale-fields to the east at Hopetoun, Newliston and Ingliston whose output was retorted at Hopetoun or Uphall oil works. The refinery at Addiewell closed c.1921, after Pumpherston had been developed as the central refinery for all output of Scottish Oils Ltd. Addiewell candleworks continued until c.1923. The crude oil works continued until c.1956 and the site remained derelict for many years, the final works buildings being cleared c.1986