 Before the assembly line, Ts had been available in a variety of colors, including red, blue, and green, but not black.Now, paint had become a production bottleneck; only Japan Black dried quickly enough, and not until Duco lacquer appeared in 1926 would other colors reappear on the T.

In 1915, Henry Ford went on a peace mission to Europe aboard a ship, joining other pacifists in efforts to stop World War I.This led to an increase in his personal popularity.