Thank you cheetah, but I did mention that I took a section from the link you pointed out in your comment. The link was added above the italicised quoted pieces in my article. Please go through the posts to see our references before you add your comment.

Trying to find what the colour Indigo truly looks like was quite a challenge on google too. I enjoyed these two answer I got from the following link:
.https://www.quora.com/What-is-the-true-color-of-indigo

Annie Wang, studied at University of California, Davis