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We bought a bronze finished lockset about five years ago, and now a lot of it is ashy looking and green in some places. It looks a little worse every year. It's on an exterior door facing west. Would it be the sun causing such discoloration? If so, what's a good finish for an exterior door lockset?

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up vote 8 down vote accepted

It's called a tarnish or patina and is caused by oxidation of the copper in the bronze. The sun's heat will accelerate that reaction somewhat compared to one in a cooler place.

If you don't like it, simply clean the lockset with Brasso when it starts to look discolored. It will take some elbow grease the first time because the tarnish has had time to build up, but if you keep up with it, subsequent times will be a lot easier.

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After a while the finish will probably start to wear through though. –  UpTheCreek Sep 9 '11 at 19:44
    
@UpTheCreek, I hope not so quickly. Those things are pricey. –  Stephen Burns Sep 10 '11 at 5:49
    
Gotta love that Brasso! I think the Navy used to by that stuff by the tanker load. lol. –  shirlock homes Sep 11 '11 at 10:39
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