Red onion
This is actually a very good question that most people do not know the answer to, ‘why do we call it red onion when it is clearly purple?’. Well, the answer will surprise you, it has to do with the color that red onion makes when it is used in dye.
When the red onion is used to make dye it turns red, so it may seem purple now but really the color will transform into something else. See, we told you it was not just a random thing that someone who did not know colors just decided to call red onion ‘red’ instead of purple.