Materials:

• Bicarbonate of Soda
• Vinegar
• Shallow plate with a hinge
• Blue, Red and yellow food colouring
• Three cups

Instructions:

• In the shallow dish place three cups
• Place bicarbonate of soda in each cup
• Place each food colouring in one each of the cups
• Pour the vinegar and watch how the bicarbonate of soda turns red, blue and yellow in the cups
• Watch as the gas rises and over flows on to the plate how the colours mix together