Vintage air vents and florescent lights at a country store

Why do old florescent lights turn pink with moving beams? I've noticed this many times but I don't know why.
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[@Fluffberymoff]

0:09 0:18 Mercury starved
Edit: and the air vents look like K-vents or United States Register Co things

[@Alexthefancollector]

So that's why some of the lights are pink. Thanks!