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The Japanese Nagura Stone is used for cleaning a Water Stone’s surface that has glazed over. It is also used to create a slurry on another Water Stone, creating the ultimate in polishing compounds, prior to honing the Cutting Edge.
These artificial Nagura stones are the equivalent of the 8000 gold stone and therefore there will not be a problem with particle contamination when used on other grit sized stones.
The Japanese Nagura Stone is use in conjunction with the 6000 grit side of the Japanese Combination Waterstone 1000/6000 grit, the 4000 Grit, 6000 Grit, 8000 Grit and when used with te 10,000 grit Japanaese Water Stone it will become the equivalent of an Ultra-Superfine 9,000 grit particulate size as it is worked.
To make a slurry for polishing, simply wet the host Water Stone and rub the Nagura Stone on its surface. The Nagura Stone will quickly wear to create a thick cream like slurry on the host Water Stone. Use the slurry to polish the sides of tools that may have become stained with use.
As is usual with Japanese Water Stones they need to be saturated and the constantly doused with water if maximum performance is to be achieved whilst they are in use. To do this, simply place your Japanese Water Stones in a bucket of water and leave them there to soak for about 5 to 10 minutes before you start to use them. Then, whilst in use, Keep sprinkling the surface of the stone with clean water and or when it becomes dry. It is important to note, however, that you should never leave Japanese Water Stones in water if there is the remotest chance that the water they are in will freeze, since there is a strong possibility that this may crack your stone.
Phase One to achieving a truly Razor Sharp Cutting Edge, if your knife blade has become excessively dull, damaged or chipped, is to re-establish a proper cutting edge and remove all of the damage. To do this efficiently and in minimal time you should use the 240 grit (Extra-Course) Japanese Water Stone or a good quality Extra-Course Diamond Whetstone.
This 240 grit (Extra-Course) Japanese Water Stone cuts steel with amazing speed, but as is the nature of these stones they wear somewhat quicker than would an oilstone so when these fast cutting stones eventually do become hollowed, or concave, in the use, they can easily be re-trued using the Ceramic Flattening Stone. This massive Water Stone measures 205mm long by 75mm wide by 50mm high so this massive lump of stone is going to last a long time.
Phase Two is to use the 400 grit and then the 800 grit Japanese Water Stones. These two Course water stones are used to flatten the backs of blades and form the cutting edge; they leave the metal dull but smooth.
Phase Three to achieving a Razor Sharp and highly polished blade is to follow on from Phase Two with either a 1000 or a 1200 grit Japanese Water Stones, which will further refine, partially polish and remove scratches from your knife blade that previous grit sizes create.
Phase Four to achieving a Razor Sharp excellence is to bring your knife blade edge to a near mirror and then a mirror finish; this is done on the 4000 grit, the 6000 grit, 8000 grit and the ultimate 10,000 grit Japanese Water Stones, which is helped along with the additional use of a Japanese Nagura Stone.
Phase Five, the final Phase, to achieving a Razor Sharp perfection is to is to Strop the knife edge with a good quality leather strop such as the Shark Designs - Field Razor Strop (Deluxe) or Hand Razor Strop. Stropping a cutting edge helps to further polish the edge and if done often enough constantly realigns any curling that might be taking place. There are two main types of strop; one is just a simple strop that has no abrasive properties whatsoever and is basically used to polish and realign the blades cutting edge as already mentioned, the second is what is known as a Honing Strop. The Honing Strop is a basic strop that has been impregnated with a honing compound such as White Jewellers Rouge or something like Tormec’s Honing Paste. Honing will abrade the blades cutting edge, all be it at a very low level, making it absolutely ideal for resetting a cutting edge that is just beginning to dull, back to a Razor sharp state, thereby prolonging the periods between re-sharpening.