One More Thing - Litterbox Comics
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Elementary particles didn't have a color for most of history, but recently xkcd made a comic on the topic, giving us a definite answer to the question.
Link?
Probably this one: https://xkcd.com/2734/
Electrons are yellow, Protons are red, and Neutrons are gray
I always thought of Protons as blue for some reason, but I'm glad everyone thinks of Electrons as yellow.