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It will depend on the stone, you can always use well used diamond plate to raise slurry.

the sharp corners of a hard slurry stone can dig into the base stone when too much pressure is applied

you need softer tomonagura, you can also make some grooves in the tomonagura to make slurry easier.

In Japan the norm is to use the stones with slurry but that doe snot mean that is how a stone should be used always.
For me at least half the fun is to experiment and find out how to use a stone to...

if used incorrectly they will scratch yes

if you keep on going that will change and the razor will start gliding as if on glass, then you are done.

Lemur what do you mean by use with water only?
For me that is 5-10 very light passes and that is it.

The book by Iwasaki is just a set of guidelines for me. I never payed attention to his techniques, one can get perfectly fine edge using the old boring x-strokes and circles.

Because they are naturals and all vary in quality and properties. I view the manuscript as a set of guidelines of how a Jnat can be used, not as a rule book to follow.
Every stone is different and...

not going to work well because marble is not a JNat and has different properties.





the nagura is used to emulate grit progression on one base stone.
A good finisher should be able to be...

When I use Jnats I use a prepolisher with mejiro nagura to prep the edge to move to a finisher.
On a finisher most of the time I use tomonagura slurry dilution and finish on water with a few...