Rainbow Milk

Magic but real experiments! A Romanian project for Physics

The activity for pupils age 12-18

Red, blue and yellow are called the primary colors. Just by mixing these colors, you can get all the colors of the rainbow:


What you need: red, blue and yellow food color; 1 cup milk; dish soap; shallow bowl


  • Pour 1 cup of milk into the bowl
  • Add 3 drops of red food color to one edge of the bowl  1/3 of the way around the perimeter add 3 drops of blue food colour, then another 1/3 of the way away around add 3 drops of yellow. Br careful not to mix or jiggle the bowl
  • Squeeze a drop of dish soap in the center of the bowl
  • Record what you see.
  • What do you think happened?

Devices: You need a webcamera or just a mobile device to record the experiment

Web 2.0: Upload on Flickr (or other photo-sharing site such as Picassa) Find appropriate music with a CC license (go to http://creativecommons.org/legalmusicforvideos)

See the experiment here: http://www.flickr.com/photos/clcziprok/3625829212/in/set-72157619648558617/

This post is also available in: Romanian

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