How well do you know your colours? Take this quick 5 question quiz to test your knowledge! Question Title * 1. The colour with the longest wavelengths is... Blue Yellow Red Green OK Question Title * 2. Approximately how many colours can be seen by the human eye? 100 million 400 million 700 million 1 billion OK Question Title * 3. Approximately what percentage of the world's population is colour blind? 1% 4% 7% 10% OK Question Title * 4. What is believed to be the first colour a baby sees? Yellow Red Violet Blue Black OK Question Title * 5. Is fear of colour a real phobia? Yes No OK DONE