I write directly on the wood. I use a pen that has pigment ink, is acid free, archival quality, light fast, waterproof, fade proof and no-bleeding. It's a ZIG by Millennium from Wal-mart. Haven't seen the pen at the store lately so they may not carry it anymore.
You can tru-oil or superglue right over the ink with out smearing it. You can also use an oil base stain over it as well. For alcohol stain you must use the ink over the stain.
Only problems with the ink bleeding is with soft arrow woods. Usually a little burnishing before hand wil help with that.
ART B