Bluish-black element of the halogen group; symbol I (6)

I believe the answer is:

iodine

(Other definitions for iodine that I've seen before include "Black/violet element" , "Disinfectant made from seaweed" , "Element with symbol I" , "Nonmetallic element in seaweed" , "Antiseptic found in seaweed" .)

I've seen this clue in The Mirror.

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