Like Crayola's Unmellow Yellow and Atomic Tangerine (4)

I believe the answer is:

neon

(Other definitions for neon that I've seen before include "Atomic number 10" , "Colourless, odourless rare gas" , "Colourless noble gas" , "Gas used in fluorescent lights" , "One of the six inert gasses" .)

I've seen this clue in the LA Times.

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