I am not color blind...color ignorant maybe.....but not certainly color blind. 
One of my brother-in-laws is color blind and a keyboard player. He hates electronic equipment with Red LEDs that turn Green when ready. He can't see the change in colors. He told me that he likes Blue LEDs though.
A while back he and my sister saw the play "Wicked". Mid performance he leans over and asks my sister, "Is the Wicked Witch of the West green?" He could not tell and the witch's skin color was never mentioned in the "Wizard of Oz"! To him the witch just looked darker.
My other brother-in-law is also color blind and a chemistry professor. I am surprised that his has not blown himself up. If I remember my college chemistry, there are times where you have to watch to see if the solution turns a certain color before it goes unstable.
Years ago a friend was taking me home from a meeting. It was night time and he reached up behind the visor and put on sunglasses. I turned to him and said something like, "You do know it is night time, right?" He said yes and that he was color blind. The glass helped him distinguish street light colors from a distance. If I remember I think that they were yellow marksman type glasses. I guess it makes sense that it would change the appearance of the colors.
One of my brother-in-laws is color blind and a keyboard player. He hates electronic equipment with Red LEDs that turn Green when ready. He can't see the change in colors. He told me that he likes Blue LEDs though.
A while back he and my sister saw the play "Wicked". Mid performance he leans over and asks my sister, "Is the Wicked Witch of the West green?" He could not tell and the witch's skin color was never mentioned in the "Wizard of Oz"! To him the witch just looked darker.
My other brother-in-law is also color blind and a chemistry professor. I am surprised that his has not blown himself up. If I remember my college chemistry, there are times where you have to watch to see if the solution turns a certain color before it goes unstable.
Years ago a friend was taking me home from a meeting. It was night time and he reached up behind the visor and put on sunglasses. I turned to him and said something like, "You do know it is night time, right?" He said yes and that he was color blind. The glass helped him distinguish street light colors from a distance. If I remember I think that they were yellow marksman type glasses. I guess it makes sense that it would change the appearance of the colors.