Is There a Difference Between Two Different Colors?

If you are able to correctly call each time I switch or don't switch, then I can know that you're telling the truth. So on the first attempt, I would have a 50-50 chance of guessing the right answer. And it's zero knowledge because I don't actually have to tell you which color is which. Maybe after 10 guesses, it's still pretty like it's unlikely that I guess correctly, 10 times in a row.