Crossword Genius

Tincture used in painting (6)

Ross

I believe the answer is:

iodine

I'm a little stuck... Click here to teach me more about this clue!

'tincture' is the definition.
(iodine is a kind of tincture)

'in painting' is the wordplay.
I cannot really see how this works, but
'in' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'used' acts as a link.

Can you help me to learn more?

(Other definitions for iodine that I've seen before include "Mild antiseptic" , "Dark-violet antiseptic" , "Disinfectant made from seaweed" , "Infamous tablets in case of a nuclear emergency" , "Mother-of-pearl" .)

I've seen this clue in the Evening Standard.
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