Volantino

THEWIDEWORLD OF MILK AND ITS DERIVATIVES SCIENTIFIC EXPERIMENT: MILK OF MANY COLOURS The purpose of this experiment is to highlight how each food is made up of different elements that can react with the substances that they come into contact with. TOOLS: • Whole milk • 1 plate • 1 coffee cup • Differently coloured food dyes • Dishwasher liquid detergent • 1 cotton bud, preferably biodegradable Pour a little milk onto the plate and wait until it is still. Gently add a few drops of different dyes in the centre, without letting them touch each other. Use the tip of the cotton bud to touch the drops of dye in the milk in the centre of the plate. Keep the cotton part of the bud immersed for a few seconds and then take it out, being careful not to mix the milk. Pour some detergent inside the cup and dip the other end of the cotton bud in it. Immerge the tip soaked with detergent in the centre of the plate for about 15 seconds, touching the drops of dye again. Dip the same end of the cotton bud back into the cup with detergent and try to touch the surface of the milk in various points on the plate. • Touching the milk with a clean bud does nothing • Touching the milk with the cotton bud soaked with detergent moves the colours and they continue to do so even after removing the bud. Milk consists of water, fats, proteins, sugars, vitamins and mineral salts. In particular, fats and proteins change their shape when they come into contact with the substances in the detergent: THAT’S WHY THEY MOVE! SUPER FOODIES LAB PROCEDURE: WHAT CAN WE OBSERVE?