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Old 01-08-2020, 03:38 PM   #14
dataweaver
 
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Join Date: Aug 2004
Default Re: [Thaumatology] Alternate Spell/Ritual Categories: Colours of Magic

The confusion here is that there are two ways to approach color: the frequencies of light, or the way that the eye reacts to light. The eye picks up three colors: red, green, and blue; as such, all colors that we see can be replicated by mixtures of these three. That includes orange, yellow, indigo, and violet.

But as frequencies of light: orange, yellow, indigo, and violet are monochromatic. You can have an orange light that's a single frequency; it will trigger the red and green receptors in your eyes, and your brain will interpret that mixture of red and green as orange. And because of that, you can also get that same result by hitting the red receptors with red light and the green receptors with green light. This is what's referred to as “a brown”. Orange and yellow (monochromatic colors) can be simulated by browns: in terms of what you can see, there's no difference. But that's not because there's no difference; it's because our eyes are unable to discern the difference. Run orange light through a prism, and you'll get a single band of orange; run brown light through a prism (even brown light that looks orange to the human eye), and you'll get spikes in the red and green bands.

Likewise, indigo and violet (also monochromatic colors) can be simulated by purples. In the same way that “a brown” is defined as a mixture of red and green, “a purple” is defined as a mixture of red and blue. But indigo and violet themselves are individual frequencies of light.
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