The Iodine clock reaction or Landolt reaction is a classical chemical clock demonstration experiment where two clear solutions are mixed and originally there is no visible reaction, but after a short time delay, the liquid suddenly turns to a shade of dark blue.
The Iodine clock reaction or Landolt reaction is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered in 1886 Landolt, H. Ber. Two clear solutions are mixed and at first there is no visible reaction, but after a short time delay, the liquid suddenly turns to a shade of dark blue.