Children

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Milk Art

This is an easy experiment observing the interaction of dish washing liquid and. Milk. It is great fun creating your own “Milk Art Volcano”

 

YOU NEED
  • A dinner plate
  • Milk
  • Food colouring
  • Tooth pick
  • Dish washing liquid
  • Old ballpoint pen
WHAT TO DO
Pour milk into the dinner plate
Prof Pink pours milk

Remove the plastic ink tube from an old ballpoint pen, cut off the nib andclean out any ink still in the tube.

Be careful ballpoint ink stains.

You now have a home made pipette.

Dip one end in the red food colouring and close the other end with your thumb,

When you remove it a drop of colouring will lodge in the open end of your pipette

Home-made pipette at work

Add a single drop of colouring to the edge of the milk in the dinner plate.

Repeat with any other colours you want to paint with

Be careful, food colouring leave stains. that are difficult to remove

Food colouring dropped into milk
THE FUN

Now the fun starts.

Dip the tip of a tooth pick in the dish washing liquid.

Add dishwashing liquid

Now carefully touch this tip on the very edge of the milk at any of the colour droplets in the milk.

The food colorant will shoot out like spray paint.

Explosion of colour

Repeat the soapy touch with the other colours.

The colours will all scoot across the milk making your art patterns.

Experiment with many colours.

By touching the soapy tip at various points on the colorant you can control the direction it will spray it across the milk.

Take a fresh dish of milk and drop two drops of each colorant in the middle of the dish.

Now add a drop of liquid soap.

Observe the turbulent motion of the colours as it spreads in a volcanic eruption.

Take some pictures and use your computer programs to create your own greeting cards

 

THE SCIENCE


Liquid molecules are attracted to each other, causing a liquid’s surface to contract and resemble a thin, invisible elastic skin - a property known as surface tension.

As milk contains mostly water (87%), the water soluble food colouring dissolves easily. Soap on the other hand lowers the surface tension of the water and attaches itself to the fat molecules in the milk.

The rapidly mixing fat and soap causes the turbulence and the food colouring indicates this turbulence.

PROF. PINK’S WARNING


Clean up the mess you made in the kitchen before your mother comes home. Do not pour the used milk back into the milk bottle.

Have fun trying to get the food colorant stains from your fingers. Don’t blame me!