Why is indigo a color

He decided to send them all to his daughter so she could try and grow them in South Carolina. Eliza set to work growing the indigo crop since she knew the demand from Britain was strong for indigo dye.

Despite her efforts, none of the indigo seeds yielded a successful harvest. But Eliza was determined to keep trying, and she finally had a successful harvest after several seasons. Her father sent a friend, Nicolas Cromwell, to help her learn how to make cakes out of the dye to export. Cromwell, however, saw that her successful business could damage his own and tried to ruin her harvest as they made the cakes.

So, instead of keeping her trade a secret, she shared her knowledge about how to grow the crop with other fellow farmers.

And Indigo quickly became a cash crop, second only to rice, and the farmers raked in profits. Demand soared from 5, pounds in to , pounds in ! But the story of indigo was just getting interesting. British demand soon plummeted — the American War for Independence started in so the British picked up the trade for themselves once again. Unfortunately, they did this by making indigo dye in India, exploiting many Indian workers. The treatment was so bad that there were indigo revolts and riots in the s.

I see it as a rich colour. People love the colour. No need to wait until next weekend to score sweet sales on gadgets, gear. The Vancouver-based entrepreneur behind the app Shop This City hopes to remove the barrier between customers and small local businesses by offering a searchable, up-to-date display of a business's available inventory and styles. Sign up to receive the daily top stories from the National Post, a division of Postmedia Network Inc.

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The reason for the colours we see is to do with the response of the eye, which contains colour-sensitive dyes which absorb light of different frequencies. Our colour perception depends upon the amount of light absorbed by each of the dyes. Indeed, but this does not even begin to explain why we see six or seven distinct colours in the spectrum when the spectrum varies smoothly and continuously in wavelength.

The question is why is colour vision categorical in this situation. How ridiculously condescendingly Politically correct of you! And just what happens if one of your students is colorblind, what then? BIV…What the hell is wrong with that? The problem with the spectrum, is that some artists and brain dead liberals want to rewrite history and bury Sir Isaac Newton! And since we are on that topic, who the hell are you to reduce art into a feel good liberal agenda, and make sure that it your way or the highway!

Indigo used to be a light blue violet between blue in ultraviolet on the visible spectrum…. Now the art world has mixed black into what was a denim jean blue color, and have made it the new BLACK! So apologies is I miss something in my response.

I tend to agree that there are only six distinct colours in the spectrum, not for some political, modern or politically correct reason, but simply because when I look at the spectrum with my own eyes I only see 6 colours. As it happens I am in awe of Newton. He is one of my all-time favourite scientists.

Without showing the names, but with names like: azure-blue, sky-blue, clear-blue, see-blue, lagoon-blue, dark-blue, navy-blue, indigo, etc. Look which distinct colours the children pick or give this quest to art students with their task to undo their rainbow-colour-knowledge and look as a small kid.

Maybe I can create one in the room using a prism. We see distinct colours by the way our receptors work. Most people, as you know, have three sets of cones with a specific peak frequency which determine which colours we see. The very basic sums can be seen in a television colour bar chart — usually eight bars with the addition and subtraction of all light — black and white.

This, done electronically with our subjectivity taken away. It may be that Newton describing the initial colours of the split light, named cyan as blue and blue as indigo to differentiate between the two in that part of the spectrum.

We in the west seem to have a blind spot for it. Even some website explaining colour, print a spectrum without cyan which looks odd when compared with a photograph of a spectrum.

Thanks for the comment. I still think you are not quite getting the point though. Yes, the photoreceptors underpin our colour vision and each wavelength of light in the spectrum gives a unique ration of these cone responses. This allows us to distinguish one wavelength from another. At best we can distinguish differences of just 1 nm. Towards the long and short ends of the spectrum, of course, our performance falls off and we can only distinguish changes of about 5 nm.

However, that still leaves about different hues that we can see. The real question I am asking is why we see bands why do we see bands of red and yellow, for example, with quite sharp cut-offs? I mentioned my blog series on the rainbow in a previous comment.

Here is the latest of three posts on my blog on the issues inherent to the rainbow. I would be curious to hear your feedback on it. Thanks for the reply. I have to say that my knowledge of quantum catches is far less than yours!

I can only make an analogy with other models. I will certainly read up on it, thanks for the information on Rushton. Furthermore, the shape or bandwith of the response curve of each cone may determine the width of the band and the relationship with other cones.

A test of this might be to pass different hues through a single coloured plate to a photoreceptor and note the output.

Here are what the codes look like. No wonder indigo is so misunderstood. The word indigo also refers to a dye made from the ndigofera a species of plants that were cultivated in East Asia, Egypt, India, and Peru. The earliest use of indigo dye dates to around BC. The blue dye can be made from two different types of plants: the indigo plant, which produces the best results, and from the woad plant Isatis tinctoria.

The psychological meaning of the color indigo is complex, but it is most associated with intuition, creativity, and spirituality. Indigo has a biblical and scientific meaning. The placement of the color in the rainbow gives it significance.

It is believed that the colors violet, indigo and blue symbolize the three Heavens. Violet symbolizes the throne of God. The color indigo represents the universe. I saac Newton first placed indigo as one seven base colors of his work in the mids.

Newton used a prism on a beam of sunlight, which resulted in a rainbow-like band of colors on the wall. He could see seven colors red, orange, yellow, green, blue, indigo and violet.