Question

How do you explain color to a blind person?

Answer 1

in scientific term - you can tell him about the wavelenght and frequency of the colour related to every colour.

Answer 2

let me give you examples to make it simple

if you take red you can tell the person about heat or fire and if we take blue we can give the example of water or any other cold substances and follows green ,trees like that we can make a blind person understand colours.