Tie dying tee-shirts with food colouring is a fun-filled activity that children and adults can do at home. Because cotton tee-shirts do not absorb food colouring very well -- the food colouring acts more like a stain -- it's best to use wool. Wool absorbs the food colouring more easily, creating vibrant colours. Consider dying tee-shirts on a rainy day when you're stuck inside and then wearing them outdoors when the weather allows.
Hold the wool shirt at the collar and the waist line. Twist the shirt like a rope and secure it in place with rubber bands.
Pour 1 litre (4 cups) of water and 50 ml (1/4 cup) of vinegar into a large bowl. Place the shirt in the bowl and let it soak for 30 minutes.
Drip food colouring on to the shirt in various patterns and directions while the shirt is still in the bowl of water.
Heat up the fabric by placing the bowl and shirt in the microwave for about 30 seconds.
Allow the shirt to cool down in the water, then rinse it in cold water.
Allow the shirt to air dry. Once dry, the shirt will be ready to wear.