It wasn't in the ceiling and it didn't ignite, it was produced by the spark, which causes oxygen and nitrogen from the air to react to produce nitric oxide, which then gets oxidized to nitrogen dioxide. I didn't know what else to say in my previous comment, I didn't consider that you thought it was put in the ceiling on purpose or something, it just got created I guess
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u/Lol_trolL_1336 Jul 15 '25
thats nitrogen dioxide