Ariel is the expert when it comes to etching blades in order to reveal damascus patterns. I personally use diluted warm vinegar, and I have a friend who uses wine (cheap one of course, God forbid wasting a good bottle
).
This hread has examples with scabbards, although the scabbards are not in good shape:
http://www.vikingsword.com/vb/showthread.php?t=4904
Regards,
Teodor