technical question: the gold color in a b&w film
When I saw the black-and-white film "Greed" recently on TCM, the first thing I noticed in the opening panning-for-gold sequence was that the pieces of gold flakes were actually colored yellow. Later, in a scene in which a traveling dentist comes through town with a large model of a tooth hanging from his carriage, the tooth was colored yellow.
How was this done? Were those scenes in the film hand-colored frame by frame?