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I don't understand how the visible electromagnetic spectrum starts with red but ends in violet, which is blue and red mixed together

So it starts with red and finishes with half-red.

How is that possible?
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DrWatson · 70-79, M
I wonder about that too.

I don't have a full answer, but I do recall an encyclopedia article I glanced at as a kid.

The rules we learn about combining colors apply to pigments. But the rules for combining light are actually different.

I'm too lazy to look it up now, but I think that is the crux of the explanation.

 
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