How to use the Nagura whetstone

1)Usage for natural whetstone
Nagura plays the role of making a hard natural whetstone stand out.
Next, the Toguso (mud juice from the whetstone) is quickly put out from the natural whetstone 
that is hard and hard to produce.
This is a function that promotes polishing.
It mitigates the phenomenon of slipping and stretching due to the compatibility of the natural whetstone 
and the blade. In other words, using Nagura improves the compatibility of the whetstone and the blade.

2)How to use for artificial whetstone
Basically it is the same as using a natural whetstone, but with an artificial finishing whetstone, 
it is also useful for removing "clogging of the part that sticks black as if it is slimy".
The cause of the black Toguso (mud juice from the whetstone) sticking to the whetstone is insufficient 
water supply,but Nagura is an effective way to relieve the symptoms.

3)How to use as a whetstone for direct sharpening
The abrasive contained in Nagura is as effective as the quartz contained in the natural finishing stone.
Nagura is white because most of it is made of quartz powder.
Up to this point, the only natural whetstone that contains a mass of abrasive is Pure Mikawa White Nagura, 
and it has the performance and sharpness as a whetstone for directly sharpening blades.

How to make mud juice from whetstones using Nagura
Water the finishing whetstone and rub Nagura on the whetstone surface to release the Toguso (mud juice)
containing the abrasive.

If you polish with this this juice, you can quickly get a good blade.
Nagura itself is softer than the natural finishing whetstone.
When rubbing against a natural finishing whetstone, Nagura wears out first, and the quartz inside does not 
come out directly, but is crushed into fine particles and melts.