Rusty Discoloration

The Riverwalk along the Chicago River takes you under the bridges.  Each bridge is on a cycle for refurbishment so, while they are repainted regularly, they do progressively show signs of weathering.  Some of them are rather old structures with the iron and riveting being something of a period long gone.  I stopped for a while to look at the different colors that the gentle corrosion created.  Nothing too drastic but an interesting contrast with the original paint color.

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