Crossword Genius

Kind of deep blue — metal (6)

Ross

I believe the answer is:

cobalt

(Other definitions for cobalt that I've seen before include "given radiotherapy with this?" , "Silvery-white metal used in alloys" , "Ferromagnetic metal - shade of blue" , "Sort of blue" , "A deep-blue colour (6)" .)

I've seen this clue in The Guardian.
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