Hi Liz, Thank you. I'm definitely not debating the color itself, the wavelength falls within the visible spectrum, I was debating more of it's place in the grand scheme of colors. The rainbow and everything we see is a breakdown of primary and secondary colors, indigo is more of a third-tier blend. Aqua is given metaphysical aura properties, but not listed as a "color in the rainbow", that was more of my point - from the artist angle.