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Thread: Colours in the rainbow, etc

  1. #1
    Married Mouth-breather JohnClay's Avatar
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    Colours in the rainbow, etc

    When I was in hospital a few weeks ago I thought about colours...

    there are additive colours (light) - (RGB)
    red, green and blue. When combined in pairs they make yellow, cyan and magenta. All together they make white.

    the subtractive colours (pigment) -(CMY/CMYK [blacK])
    cyan, magenta, yellow - in pairs they make blue, red, green. All together make black.

    People normally say there is purple in the rainbow - but violet is actually blue. ("violets are blue")

    Rainbows go from red to blue:


    I heard that rainbows can have purple in them when there is a double rainbow (blue plus red)

    In some ways there are only 3 colours in the rainbow:

    red, green and blue - yellow and orange come from red and green and there is cyan (green plus blue)

    In some ways there are 7 colours:

    infra-red, red, yellow, green, cyan, blue, ultra-violet

  2. #2
    singularity precursor Limes's Avatar
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    Peso for your thoughts.
    Better yet, a Liberian penny.

  3. #3
    Tsundoku LordLatch's Avatar
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    I would demand to see this mythical penny first
    Stand clear of the closing doors, please.

  4. #4
    Meae Musae Servus Hephaestus's Avatar
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    Quote Originally Posted by JohnClay View Post
    People normally say there is purple in the rainbow - but violet is actually blue. ("violets are blue")
    People think they understand their own mortality, even when that understanding has just changed.

    --Meditations on Uncertainty Vol ξ(x)

  5. #5
    Married Mouth-breather JohnClay's Avatar
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    Hmmm it looks like violets aren’t blue?
    https://en.m.wikipedia.org/wiki/Violet_(color)
    But on the spectrum it is between blue and invisible ultraviolet
    Well blue violets are blue

  6. #6
    Tsundoku LordLatch's Avatar
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    ..because he doesn't have it
    Stand clear of the closing doors, please.

  7. #7
    Married Mouth-breather JohnClay's Avatar
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    https://en.wikipedia.org/wiki/Rainbo...rum_or_rainbow
    "...Scholars have noted that what Newton regarded at the time as "blue" would today be regarded as cyan, and what Newton called "indigo" would today be considered blue..."

  8. #8
    singularity precursor Limes's Avatar
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    3 pfenigs for your thoughts and not a rouble more.

  9. #9
    Tsundoku LordLatch's Avatar
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    Case in point- after being called out, another fake currency promise..

    what next? Yen?
    Stand clear of the closing doors, please.

  10. #10
    quaerentibus Arthur's Avatar
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    Quote Originally Posted by Limes View Post
    Peso for your thoughts.
    Better yet, a Liberian penny.
    How about a Vietnamese dong?

    ...the currency. The currency!!

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