I tend to agree with WC on the ceramic blades. I started out using the cheap basic 7 blade, then went to ceramic. I polished them out a bit, which helped a bunch. BUT, after going to a hollow ground BK or even the Al Stohlman hollowground Tandy blade, I rarely rarely use the ceramics anymore.
I saw a few ruby blades on Ebay last week. I think there were 3. They sold for 3.00 or so. Problem: they were chipped.
DM