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@DFP
you really dont need to bother with trying to chemically strip the anodising then.
Your attempting to "mirror polish"
you shall require a dremel/rotary tool or bench polisher.
2 bars of non ferrous polishing compound, one for cutting one for final polish.
approx £2each for huge bars.
2 or 3 cotton (calico wheel & a soft buff) heads for your dremel, £1.50?
some emery paper
and wirewool.
rub away all the coloured material with some coarse paper. It should get shiny, but still be pretty rough.
Rub with some less coarse paper to try smooth out some of the scratches. Then follow with wire wool to try get it to a reasonable smooth "shine"
fit cotton wheel to dremel, dampen and apply cutting compound by spinning, work it onto the item and patiently polish away for some time.
Clean off, admire results. Then go in for final polish with 2nd compound, work away for some time.
Clean off, admire results, then go at it one last time with a dry soft shammy type cotton attachment.
finish!
alternativeley, take item to a "metal finishers" or if delicate, a jewelery polishers.