Water marks - white-ish - yeah iron. Heat marks (darkened) - more difficult. I couldn't shift it on my coffee table.
Pretty sure it's heat mark(s). Bit pissed off tbh as it's not an obvious one but obvious enough to trigger my OCD.
It's patina. Embrace it.
Turps can be pretty effective on dark marks, but also on fucking up varnish.
@jaw started
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Water marks - white-ish - yeah iron.
Heat marks (darkened) - more difficult. I couldn't shift it on my coffee table.