 Bideford Black contains carbon, silica and alumina, with the black colouration created by the carbon.The seams containing Bideford Black Stretch from Hartland, underneath Bideford, and onto Umberleigh.Bideford Black was used in a number of ways; for example, it was used as camouflage paint during World War Two, in mascara by Max Factor, by artists, and in the boat-building industry.