[Phono-L] Antiquing Reproduction Parts

[Bob]

I recently purchased a nice Columbia AH.  It has its' original finish but 
the horn arms are aluminum reproduction parts.  They are very nicely made 
but a little to new looking for my taste.  I'd like to get a patina on them 
that would be consistent with a 100+ year old phonograph.  Any of you ever 
tried to do this and can make suggestions as to techniques that work?