Rectangular rubbing bowl 13.5 x 7.5 cm, Natural Slate

Grind the ink you need for the calligraphy session you planned for the same day. Keep in mind that you should never let the ink dry inside the ink stone, because it can damage it permanently. If you decide to use bottled liquid ink and put it into the ink stone, you should be even more careful not to let it dry. The liquid ink has a lot of glue and when it dries it virtually embeds itself in the surface of the stone. A lid on the ink stone is very useful to prevent the ink from drying, especially recommended in hot wheather conditions. You should always clean the ink stone after using it. Wash it thoroughly with fresh water. You can use a soft sponge, but never use a metallic or a hard cloth because you could damage the stone.