Alaskan Yellow Cedar: Use only stainless steel nails
Below is an example of a contractor that used regular nails on an Atlantic coast home, with Alaskan Yellow cedar 1"x3" Tongue and Groove siding. The contractor erroneously thought that blind nailing the TnG would prevent the nails from corroding. The pictures show that corrosion has started, and streaks seem to come from the wood. Alaskan Yellow Cedar has tannins in its fibers that react with untreated steel, resulting in these black marks.