What color does a person who goes blind see?

They may "see" almost anything, or nothing. Firstly, the majority of people registered, officially, blind have some trace of vision. This may be only the ability to tell day from night, or excellent vision in a small patch of the visual field. Additionally people with reduced or no vision may perceive distinct formed illusions: people, buildings, vehicles... search for "Charles Bonnet syndrome" Individuals with cortical blindness may retain the ability to navigate through, for example, a cluttered room without hitting objects, though they could not "see" or name any of them.