There are over three million people in the UK that are colour blind. This means they find it difficult to differentiate between certain colours and often get colours wrong.
But spotting the signs in children who are colour blind can be tricky. According to experts, children learn by association and "guess" certain colours correctly.
For instance, if a child learns that police lights are blue, when they see other items that are the same colour through their eyes, they will identify them as blue too, even though they cannot see them as the true blue that they are.