You will need:
Small bowl of water diluted with food colouring
Small bowl of bleach
Dip the sponge into a bowl of colouring and brush the entire paper with the sponge. Leave to dry. Gently dip an ear bud dip in the bowl of bleach. Ask your child to draw a picture with the ear bud.
Ensure that your child is wearing an apron and plastic gloves. Make sure that your child washes his/her hands afterwards.