[meteorite-list] etching canyon diablo

[Francesco Moser]

Hello!
Could someone give me some tips about etching a slice of Canyon Diablo, in the past years it rusted so I want to bring it back to its old beauty.
I have use sand paper till mirror polish and use Nital 10% with a paint brush. I achieve a good contrast from the matrix and the inclusions but the Widmanstätten pattern is not so sharp neither visible. I have put it for about one day in NaOH solution for neutralizing the acid, but the inclusion turn to a gold-yellowish color :(

Please help me :)

Thanks a lot!

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Francesco