While discussing colour and whether you could explain colour to a blind person, I thought: What if the the blind person just used their 3rd eye to see? It seems I'm not the first to think of this as Astral Pulse had a discussion on it in 2007. I believe, with the growing number of people awakening, that someone reading this is willing to pose the idea to someone they know that is blind.

I've taken many journeys with my spirit guide and often I'm shown colour pictures of things.

Dr. Steven Greer has a story of taking a lucid dream tour of the beach while on vacation and his sight was more vivid than using physical eyes.

• Steven Greer Petaluma Workshop Pt. 1: The Holographic Conscious Universe, 15:55, Astral travel
  https://youtu.be/stWjS8ME1U8?t=955
  16:00 - Start
  17:55 - Costa Rica story of his astral travel along the beach
  20:00 - End of the story

If you have a friend who is blind, ask them if they've considered asking their spirit guides to show them colour. Opening one's 3rd eye takes time, but even sighted people could be considered blind if they have not tried to access their spiritual side.

Have them start with my page on Meditation to connect with their spirit guides.
https://mylightworker.org/user/jasonmonds/meditation