The manufacture of earth colours
CHAPTER VII
BROWN EARTH COLOURS 168 Terra di Siena 168 True Umber 170 Cologne Earth (Cologne Umber) 173 Asphaltum Brown (Bitumen) 174
The manufacture of earth colours
BROWN EARTH COLOURS 168 Terra di Siena 168 True Umber 170 Cologne Earth (Cologne Umber) 173 Asphaltum Brown (Bitumen) 174