I learnt that in halogens the colour is due to transfer of electrons from HOMO to LUMO during excitation but I have trouble understanding what that means. Also I don't understand how iodine is blackish in solid state while violet in gaseous state.
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Related: https://chemistry.stackexchange.com/questions/33861/why-does-color-of-halogen-deepens-and-the-boiling-point-decreases-down-the-group?r=SearchResults – Nilay Ghosh Sep 12 '19 at 03:35
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To the 2nd part, notice that dye based (= not pigment ) black colour of markers or inkjet printers is usually dark violet colour. – Poutnik Sep 12 '19 at 04:02