Artifact abrasive power is the best. But other wise ,harder grinding particles left "V" section scratch.
Approx. hardness are WA=9.0 ,CG=9.5 ,Diamond=10
It is narrow width and deep depth ,because appearance on the bevels seems so smooth!!
So artifact finish stones making mirror bevel. However, this is not necessarily authentic smooth.
It is the same as diamond grass cutter's scratch ,and blades are weaken at stress.
Easy to chip!! Grass and Japanese water quenching steel are similar hardness. Approx.5.5-LH6.0
Japanese natural whetstones are weaker abrasive power than artifact.
It means ,they contain softer grinding agent.
Approx hardness are quartz=7.0 feldspar=6.0
Surely ,the agents is shrunken so easy!! And they left "U" section scratch.
It is wide width and shallow depth ,because appearance on the bevels seems some course!!
So natural finish stones making mist and haze bevel. Because, many body say authentic smooth.
By the way ,do you know the slit of circle saw blades?
Look at the bottom of slit!! There is round punched hole.
What is this??
Slit is suitable for canceling cubical expansion that is caused from heat.
Round holes diffuse stress very well!!
Many many "U" scratches work stress diffusion in micro world.
Because the blades which was finished by natural lasts for a long time.
In addition ,the grit of grinding argent takes so wide grit range ,because it is easy to shrink well.
If your skill rose well ,reduce water ,earn rich slurry ,the power of the hand is pulled out and sharpened,
the grit range will be grow!!
In addition 2 ,Naturals was born as time was spent 20,000,000 - 250,000,000 years.
And it is an ideal crystallographic structure.
It seems dictionary structure!!
It is located in multiple layered abrasive plates.
The plates have uniform grinding agent directionality!
It increases comfortable touch , efficient grinding and keeping water well even if course or softer stones.
If we are going to make the dictionary structure ,It is so hard to complete!!!
Only the time of the eternity could make it.
The section of A dictionary aspirates water very well. That you know well!
And the individual pages aspirate water smaller than section.
They are so important for stones.
The characteristic keeping water increase slurry strength ,fine touch and decrease pouring water frequency during sharpening.
In addition 3 ,most of Japanese natural stones boiled by critical point water for a long long time.
Critical point water is known as so high pressure and high temperature water.
It can dissolve metal ,quarts and so on! It's super! It is known as the strongest solvent.
It removes impurities ,excessive quarts ,making bonding agents from the partial feldspar.
The bonding agents is belong to strong ionizing molecular !!! It makes cool slurry.
What is it?? Associates magnet.!!
It holds and suspends iron particles very well ,and avoid to choke up with irons.
Especially ,the slurry of Iyo makes the highest class slurry ,because
it is suitable for "Nagura" stones (=making slurry piece stones) well
and reset the choked up stones.
Because Iyo is the oldest historic stone in Japan. It has 1200-1500yrs history!!!
Kyoto is 800yrs.
The best Iyo stones bore fine tools ,Japanese sword with fine performance.
And the oldest wooden architecture Horyuji temple is located in JP.
We understood both artifact and natural have for each advantage.
We should know the application. Seeking for abrasive power? or ideal scratch "U" section?
Make matters worth ,"V" section has narrow width and deep depth.
It is so hard to confirm the status.. Hard to remove.
Medium grit naturals remove "V" scratch very well.
All of skillful stones lover says "Medium grit stones is the most interesting and important for sharpening".
As is often the case ,we look at bevel appearance well.
But we should look at the section of the bevel and at the bottom of scratch appearance "V" or "U"?
LOL ,We assume it is important for us.
CT scan in the our hospital can make brains a round slices.
We have to use it!! So unreasonable...
However ,We can confirm "U" scratches can remove so easy when we are
suitable for next step smoother stones. Even if scratches appearance
Enjoy Japanese water stones!
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