Hi Stephen my friend,
You are right, anybody able to post on NMB must be able to google such a word as "kao". I am very lazy by nature but I refuse to be ashamed of myself in front such an audience by asking such questions
Newbies be aware that knowledge is not "logos" (google the word) coming from "experts". Even experts are subject to errors. Research is the key-word. Sweat and strained are scholar common law. Try to read and learn and make your own opinion.
Nihonto Example : what is the difference between mokume and Itame. Even Experts disagree. It is like: Which came first : chicken or egg. Some experts say that everything is Mokume and that that itame is an extension of mokume. Some experts say the opposite. Other say there is no link.
The main difficulty is to be independant and make its own opinion - read a lot, see a lot of blades.
I can give hundreds of examples showing that Nihonto as a rule is made of exceptions.
Sue Mino is considered as being mokume hada. It is everything : Mokume, itame, masame every thing being mixed. Sue Mino is considered as being Nioi deki, true upto 70/80%, the rest is nie deki, the same smith being able to produce both kind of deki.
At the opposite early Mino is known to be nie deki but 20/30% of blades are Nioi deki.
Kantei, in my opinion, is a joke, because you have to see a blade gathering all the stereotypes from a schoom or a smith, which will happen only if you are able to handle first or second generation of masters, small chances. 99% of the blades you shall handle won't meet these criteria.
AND NOW ladies and Gentlemen I am going to sleep over this wonderful Thaï dinner and Sancerre wine I had as I am realizing I am becoming talkative, I hope Guido/Brian/Ted and Stephen shall forgive me.