Cedar strips on the exterior (and where used on the interior) were treated with "iron sulfate and kept outside for months before assembly to achieve an even patina," says Stinessen.  Photo 4 of 6 in Houses I like by Phil Blakely from A Norwegian Family Retreat Balances Private and Communal Spaces

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Cedar strips on the exterior (and where used on the interior) were treated with "iron sulfate and kept outside for months before assembly to achieve an even patina," says Stinessen.