The knife is Masakage Koishi Aogami Super (Blue Super) Gyuto 210mm HRC63+. This steel is not that easy to sharpen.
Debado MD #1000 Grid Whetstone is splash and go. My feedback tells me it feels like Cerax 1010. Still soft, but cuts ok. And it's pricy.
Debado MD #4000 Grid Whetstone is splash and go. This one is fairly hard. But working on Aogami Super is also ok. But it is very expensive one.
9 апр 2019