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Amy-Strange

(854 posts)
Mon Jun 8, 2020, 04:57 PM Jun 2020

Did you know that black is not really a color or white either...

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Why Do We Not List Black and White as Colors in Physics?

Visible light, radio waves, x-rays and other types of radiation are all part of the electromagnetic spectrum. Visible light is electromagnetic radiation with wavelengths ranging from roughly 400 and 700 nanometers. In physics, a color is visible light with a specific wavelength. Black and white are not colors because they do not have specific wavelengths. Instead, white light contains all wavelengths of visible light. Black, on the other hand, is the absence of visible light.

Definitions of Black and White

The correspondence of a color to a specific wavelength is called spectral color. White and black are excluded from this definition because they do not have specific wavelengths. White is not defined as a color because it is the sum of all possible colors. Black is not defined as a color because it is the absence of light, and therefore color. In the visual art world, white and black may sometimes be defined as distinct colors. This is different from the concept of spectral color in physics.

https://education.seattlepi.com/not-list-black-white-colors-physics-3426.html
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9 replies = new reply since forum marked as read
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Did you know that black is not really a color or white either... (Original Post) Amy-Strange Jun 2020 OP
It's always a little odd to realize that Phoenix61 Jun 2020 #1
Actually, objects absorb all colors except the one you see, but... Amy-Strange Jun 2020 #5
Yes, DH was a physicist. marybourg Jun 2020 #2
This is absolutely true. CaliforniaPeggy Jun 2020 #3
Nor do many of those assigned to black and white descriptions. Hortensis Jun 2020 #6
Brown isn't on the spectrum, either. Igel Jun 2020 #9
So? I have never seen a person who actually BLACK in color. I have never seen a person who was WHITE BamaRefugee Jun 2020 #4
When I was a child, marie999 Jun 2020 #7
I think they still do, but... Amy-Strange Jun 2020 #8

Amy-Strange

(854 posts)
5. Actually, objects absorb all colors except the one you see, but...
Mon Jun 8, 2020, 05:16 PM
Jun 2020

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that probably means the same thing as you wrote.
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Hortensis

(58,785 posts)
6. Nor do many of those assigned to black and white descriptions.
Mon Jun 8, 2020, 05:29 PM
Jun 2020
Red, yellow and brown are no longer acceptable.

Given the realities of this troubled and angry transition to a better future, including free expression of black and white racism that's not even recognized and often considered acceptable when it is (!), those terms are picking up some very bad history. I fully expect the children of those of us who insist on still calling people white or black to have to sit us down to a firm talk on the language they allow in front of their children.

What'll replace them as simple describers, who knows? But I do know that our current behaviors are not the end of our societal evolution to better times, just...behaviors of a troubled transition.

Igel

(35,320 posts)
9. Brown isn't on the spectrum, either.
Mon Jun 8, 2020, 07:38 PM
Jun 2020

Neither's pink.

It's why we say "colors of the spectrum" instead of just "colors."

Read a novel where the author tried to be clever. A large alien species had compound eyes, and if you patterned things right you could get different eyes picking up single different colors to form a composite. "Plaid" was a color for that novel.

Then there are "forbidden" or "impossible colors". I suspect the writer got his idea for "plaid" from those, since they usually involve overlapping input from two eyes and letting the brain resolve the issue.

https://www.thoughtco.com/impossible-colors-introduction-4152091
https://en.wikipedia.org/wiki/Impossible_color

BamaRefugee

(3,483 posts)
4. So? I have never seen a person who actually BLACK in color. I have never seen a person who was WHITE
Mon Jun 8, 2020, 05:09 PM
Jun 2020

either.
What really matters is the color GRAY...the color of a person's brain.

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