Hi just finished 5th attempt to etch this result is combination of phosphorous acid and a quick dip in pcb etchant it looks very pretty close up shame I couldn't find a way to highlight or enhance the raised sections of I assume the nickel or darken the lower iron parts.
Does the fact that when acid was used it made this pattern mean it is almost certainly an iron meteorite?
Also I used an alloy wheel protector spray to seal it anyone else use this before its by autoglym http://s1382.photobucket.com/user/philszipy/library/