I'd like to add a picture to my first review below.
I really Love this bowl and use it only for the highest grades of Matcha from HIBIKI-AN. It has "conformed to Matcha" over Time with use as you can see the green from Matcha on the inner stone-like textured areas and in other ways I have noticed. This bowl feels wonderful to hold and it's great to really just relax, totally clearing your mind. The black thick glaze feels so smooth and soft
In this photograph I had prepared the 2013 Kuradashi Matcha Pinnacle quite thick. It froths up incredibly easy and never settles to the bottom in an unpleasant way even when I prepare it very thickly.