In Dune, yes the crysknife was supposed to be blooded before it was resheathed, but the crysknife was not for eating or doing work, it was a weapon only, so the point was that you didnt draw it unless you intended to kill someone. (just like a loaded gun)
Of course, the fremen had blood that coagulated many times faster than a normal person, so a little cut was nothing to them.
The crysknife was made from the tooth of a giant sandworm and was worn next to the body at all times. The reason was that the body's electric field kept the knife from disintegrating. (not blood, electricity)
There were some cyrsknives that had been "fixed" and did not need to be carried next to the body at all times..
According to Frank Herberts' description the crysknife was "double edged and curved like a kindjal with a 20 cm blade. The handle was black and deeply ridged for a strong grip"
Sounds just like that knife made from a horn that HI sold here a month ago...
I want one now!