Demos by PIRA

  6F10.16Three-color projector for additive color mixing with arc lamp.
  6F10.20Cyan, magenta, and yellow filters mix subtractively on OHP.
  6F10.25Newton's color disk: When rotated,appears white.
  6F10.30Arc light spectrum recombined with concave mirror on lucite rod.
  6F10.61Color by reflected and transmitted light, using gold leaf.