The answer, based on the provided information, is essentially no, neon brown does not exist in the truest sense.
Here's why:
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Neon colors are super saturated and bright: The very definition of "neon" or "fluorescent" implies intense saturation and brightness.
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Brown is unsaturated: The video suggests that brown is essentially the opposite of neon, as it is an unsaturated color.
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Brown is created by mixing: Brown is often created by taking orange and desaturating it.
Therefore, because neon colors require high saturation, and brown is inherently unsaturated, the concept of a "neon brown" is contradictory. While one could technically create a color that visually resembles a brown but has a slight fluorescent glow, it wouldn't meet the criteria of a true neon color due to the desaturated nature of brown. It would likely just appear as a dull, unsaturated color.