article_snippet: For colour blind people, red and black may look the same.
article_snippet: Commonly, red and green don’t look different, they look the same.
article_snippet: If there’s a colour filter, like glasses,  that can separate colours they suddenly can see red and green again.
article_snippet: For example, completely different colours like red and black might appear the same.
article_snippet: For example, completely different colours like red and black might appear the same.
article_snippet: Before, red looked like a brown to me.