Mopaka or Mokaka tree (Guibourtia demeusei) trunk with solidified 'Paka' resin. The resin 'Paka' is used by the Ba'Aka people like a candle for light and to ignite fires. During the colonial era, the resin was purchased by the colonialists. Bai Hokou, Dzanga-Ndoki National Park, Central African Republic.