Color Challenge: Saturday - Indigo, Yellow-breasted Macaw

Indigo has been quite a confusing colour for me as it seems like everyone has a different idea on what it is. 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
Answered Dec 16, 2014

Unless your computer is calibrated to the Pantone spectrum, it's unlikely you'll see colors exactly accurately on your screen. Indigo is a natural pigment which comes from plants. Here is a dot of natural indigo on paper:

While Indigo refers to a general color that to my eye is a darker, cool-toned blue tinged with violet. Most natural indigo is from the Indigofera plant, which grows in tropical regions. Today, however, most indigo is synthetic.

Tim Kaye, have studied evolution of the visual system
Answered Dec 16, 2014
Isaac Newton popularized indigo as the name of one of the 7 basic colors of the spectrum. He explained his reasons: because 7 is a perfect number built into the fabric of the universe and the laws of nature. Examples included in the 7 planets (at the time the sun, the moon, and the 5 planets known at the time). Newton was first and foremost an alchemist (at a time when alchemy had already been succeeded by chemistry). Inventing physics and calculus was just his day job.

At the time, "blue" referred to the dominant hue of the sky, as perceived by the human visual system (about 475 nm), compared with the modern concept of blue, which is closer to 460. Since then our conception of blue has shifted downward, in large part due to synthetic dyes invented in Prussia and more broadly in Germany in the 19the century. At the time it was considered leading-edge chemistry. It revolutionized the textile industry and changed how people think of colors. We now think of "color" as something intense, with high saturation. At one time, "bright-colored clothes" referred to something more muted.

In Newton's day "indigo" referred to the color of the dye from the indigo plant, or what people today would call blue. As the definition blue got shifted downward, indigo shifted too. Today indigo usually means something on the borderline between blue and violet, or about 447 nm.

When I looked at this Yellow-breasted Macaw I decided that the bottom section of his top side feathers and tail looked like Indigo to me, I might be wrong but it seems like the colour Indigo depends on the eye of the beholder.

The Macaw is native to South America and the Yellow-breasted Macaw is one of six genera. Macaws can reach a size of 86cm, weigh between 900 -1500g and lives up to 35 years.

This Macaw mate for life. The female lays up to 3 eggs and incubates it for 28 days. The chicks leave the nest after 98 days.

This is a very intelligent and social bird and are popular pet’s due to their ability to copy words if repeated to them and can be hand reared.

We came across this Macaw yesterday at an animal farm. He was quite the charmer and kept on saying "Hello" and calling us when we tried to leave. My daughter fell in love with him and now for the next few weeks I will not hear the end of her wanting a parrot.