Since the hologram reconstructed by laser loses the hue information, Benton produced two-step rainbow holography in 1969, which gave the hologram vivid colors.

• 由于激光再现的全息图失去了色调信息，1969年Benton提出二步彩虹全息术，在一定的条件下赋予全息图以鲜艳的色彩，形成激光记录、白光再现的第三代全息图。