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Trying to make aluminum change color with simple finish

We have some existing .5" thick dimensional aluminum letters installed on the walls throughout the institute. They currently have a brushed natural finish and I was wondering whether or not there might be a way to darken the color without removing them from the wall? Thanks.

Tim Huey
graphics & wayfinding - Houston, Texas
2005

Big magic marker?

James Watts
- Navarre, Florida
2005

2005

You can oil it very sparingly (olive oil or boiled linseed oil ⇦ on eBay or Amazon [affil link] or egg white), then you must heat it to 200-400 °C ( hot air gun is best)!

Good luck!

Goran Budija
- Cerovski vrh Croatia

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