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Yep. My Yaginoshima Asagi causes rusty slurry. Do you use that Suita on knives ? Fast stone ?

Interesting results Brighty. Do any of these random stones cause the rusty slurry syndrome when honing ?

Here's a few facts from my science teacher mate.

Abrading steel increases the chance of oxidation. Add water & this increases further.
The black slurry you see is also rust. Iron oxide can be...

I'll have to speak to my science teacher mate. He'll have a clue.

That could be the steel too.

I guess everything in nature is acid or base . Just depends on the degree as you say.

No idea except that things oxidise quickly on certain stones. I haven't seen it etch a blade yet but that's most likely because the razor isn't on the stone that long cf to maybe grinding on a knife...

You never know with stones what's under the next layer. Su, toxic inclusions , soft patches. I just don't like to add unknowns to the equation.
Speaking of odd things. Come across any Jnats that...

Good news but all that tells you is that particular stone has survived 2 years when using a soapy lather.
You can't extrapolate that it is safe for all stones or even for longer periods of time. ...

Don't forget to update us on the state of your stone in 3 years time :)

Brighty, I've never heard of using soap on Jnats but washing soda (Sodium carbonate) is commonly mixed in the water by Japanese sword polishers to prevent rust. It makes the water "slippery" if...