Thread: cretan honing stone

A good evening to all of you.
This is my Cretan blue hone gift from my son.
I lap it today with dray sand paper the progress was 100, 230, 400, and 600.
The question is the following.
I use a GD with a polish age up to 12K.
And after I tray on the stone only with water to see the scratch marks. Not even one.
I deed something wrong or this means that the stone only with water is higher than 12K??
Looking forward for comets.