However, because the Belgian Blue stone generally occurs in relatively wide columns with much thinner layers of Vielsalm Coticule on either side adjacent to the slate, the Belgian Blue stone is more plentiful that Coticule and thus, it’s somewhat less expensive. But, it’s also somewhat softer than Coticule and is not divided into different grades as Coticule is. Furthermore, because it is a softer stone than Coticule, it is sold without a substrate layer.

At age 10, Terada learned the basics of sushi from his father and then went on to attend RKC Chef's School in Kochi, Japan from 1987-1989. He soon earned a nickname for his fast knife, attention to detail, divine presentation and ability to create new dishes and accents based on traditional Japanese cuisine. After graduating RKC Chef School, he was called to serve under Master Chef Kondo at Yuzuan restaurant in Kochi, Japan from 1989-1992. Mr. Kondo is the master of Kansai style cooking, considered to be the high-end of Japanese cuisine. Terada earned the title Master Sushi Chef by becoming the standing head sushi chef & can serve Fugu (Japan Licensed) to the public.

When attempting to choose a whetstone for sharpening your favorite knife, the number of choices can be mind boggling. In fact, sharpening stones are divided into four distinct categories consisting of natural whetstones and manufactured whetstones which, in turn, are divided into two other categories consisting of oil stones and water stones. Then, there are numerous different varieties of natural whetstones consisting of several different materials that are quarried from different places around the world as well as several different types of man-made whetstones!
1. Diamond Stones. I’ve used two, many years ago, to sharpen steel knives & found that the diamond coating wore away. They did work well at first, but then I was sharpening on the backing material. This puzzled me, because diamond is harder than steel, but have only recently read that the diamond particles are torn off the backing material because they stick to the softer steel. Diamond stones are recommended for sharpening ceramic knives only. This info about diamond stones & steel knives I got from an Edge-Pro article.
The company is to be commended for including links to instructional videos in the package. Those videos lay out clearly how to get the most from your Whetstone sharpener stone. Once you get up to speed you’ll likely enjoy the process and at the same time achieve professional quality results time and again. Sure, it’s not fancy and doesn’t have a sleek, chrome plated design but it works.
So you are going to start at the heel and you are going to time it so that it goes all the way across. You go from one side to the other. You also want to make sure that your stone, I am not going to use as much pressure as I normally would because I cannot mount it on this showcase, you want to alternate from side to side to keep your bevel centered. Some people will take and do three times on one side and then three times on the other, the problem is that your backhand is never as good as your forehand and you end up cheating and you are going to end up with a blade that is offset. That is going to take it and thin down, you are going to get a thin bevel right on the edge. Once you get that V established, you can go from the coarser side to the finer side.
You must put the knife blade's position at the perfect angle which is called "against the stone." What's important is the blade should be facing opposite from you. Where you've determined where the bevel angle is located, then this is what you will position against the stone. It's a good idea to know the differences between various angles for certain blade uses. There's a certain height of the blade that it should be from the stone. You'll be able to find various charts on height of the blade online. Normally, for a pocket knife or kitchen knife, it'll be 17° - 22° angle against the stone. The "Rule of thumb" is the smaller the angle, the sharper the knife. Most makers will have it in the instruction or on their official website.

Now it's time to polish. This is when you'll swap over from the coarse grit to the finer grit (make sure this side is wet, too). I found the knife still had a bit of grime on it, so I gave it a wipe clean beforehand. The motion is exactly the same as with sharpening, but you can apply slightly less pressure, and limit to roughly 30 strokes on each side. 

A: Another issue that comes up with electric knife sharpeners is how to clean them. Or if, in fact, they actually need cleaning at all. The answer to the second question is that yes, they do need to be cleaned occasionally. And by occasionally we mean once a year or so if you use them with any frequency. Obviously if you’ve only used the sharpener a few times then there’s no compelling reason to clean it, other than just wanting to keep things tidy (and there’s nothing wrong with that). So, having established that sharpeners do need to be cleaned occasionally you need to know how to do so in a safe and effective manner. It’s not complicated.
Chefs will do this every day, and there's no reason you shouldn't too. Before cooking, or after you've done the washing up, honing your knife will help keep it in good condition. "When you're using a honing steel, you're not actually removing any metal at all, just re-straightening that edge, to get it back in line," says Authbert. Remember that you'll still need to sharpen it every two or three months. 

Your stroke can be straight or circular, from "hilt to tip" OR "tip to hilt," whichever is more comfortable. If you're using a small portable sharpener, stroke the blade in nearly a straight direction. Remember to always cut into the stone and never pull or drag your edge backwards. The blade edge should face in the same direction as your stroke. So, you're essentially moving the metal away from the edge. We recommend the circular stroke as it helps you maintain your angle instead of having to find it every time you lift the knife from the stone.
As you see in the pictures, it is always very important to keep same angle of about 10' to 15', which is about two coins height between the blade and the whetstone. Gently push the point you want to sharpen with your first, second and third fingers. While keeping the angle and pushing the point with your fingers, stroke the blade until it reaches the other edge of the whetstone. Then pull the blade back until it reaches the edge of the whetstone. This back and forth is counted as one stroke. Repeat it for about five strokes until you can see or feel some small burrs (edge curvatures). Then move the position of your fingers to where you have not sharpened yet, and repeat this five strokes of sharpening processed from the tip to the base of the blade.
But it's a different type of sharp, according to Joe Authbert, product development manager at ProCook. "What it does is add tiny little micro-serrations onto the edge of the blade." But fear not - your smart knife won't end up looking like a bread knife, as you'll be hard-pressed to spot the serrations. "If you looked at it under a microscope, on the cutting edge, there are these little lines that generate the sharpness, rather than a waterstone which is a smooth sharp edge," says Authbert. 
When the block is intended for installation on a bench it is called a bench stone. Small, portable stones (commonly made of bonded abrasive) are called pocket stones. Being smaller, they are more portable than bench stones but present difficulty in maintaining a consistent angle and pressure when drawing the stone along larger blades. However, they still can form a good edge. Frequently, fine grained pocket stones are used for honing, especially "in the field". Despite being a homophone with wet in most dialects of modern English, whetstones do not need to be lubricated with oil or water, although it is very common to do so. Lubrication aids the cutting action and carries swarf away.
To take off the fine scratches and burrs left by coarser stones, and to polish the surface, you can use stones starting at around 2000 grit. There is theoretically no upper limit, but stones above about 10000 grit achieve practically no measurable improvement in the edge. It is also interesting to note that above 8000 grit, there is no Japanese measurement standard. For stones labelled as having a finer grit, you simply have to take the manufacturer's word for it.
After you have completed a few passes over the stone on both sides, you can move to the final stage. This time it is P1 pressure, just enough pressure for you to control the knife. Ensure your stone is wet and now repeat the motions but with very very light pressure. You really need to focus here and ensure you are reaching the edge of the edge and again, just a few sweeps on both sides of the knife.
Let’s start with Arkansas. If you have heard about Arkansas oilstone, it uses the Novaculite stone that mined in Arkansas. The most expensive of Arkansas stone is the Hard Translucent model that begins to rare in the market. If you want to shop for Arkansas, they are available in different grade starting from Soft Arkansas, Hard Arkansas, Hard Black Arkansas and Hard Translucent Arkansas. The finest grade of Arkansas can shape such of mirror polishing edges.

Last, it should be noted that dual-sided Coticule/Belgian Blue whetstones are also sometimes available which have a layer of Belgian Blue stone on one side and a layer of Coticule on the other. Thus, these whetstones provide a softer, more coarse, grit on one side and a harder, finer, grit on the other. Plus, due to the inherent toughness of the Belgian Blue stone, these dual-sided stones do not require a substrate layer.
Table mounted device – Typically the manual powered table mounted sharpener looks virtually identical to the electric powered sharpener with a slot for each stage. Where they differ is that each slot in the manual powered sharpener has only one groove and you pull the blade through this groove toward you to sharpen the blade. Once the blade is sufficiently sharp you place it in the honing groove to refine the edge and pull it toward you again several times. If there is a third, cleaning, stage you repeat the process for that stage as well.