The scariest thing about ink drying is that mold grows during drying. As the material of the ink uses animal glue, mold will grow on the ink if it is too warm during drying. This year is a record warm winter. Even at the time of the coldest, it seems that the warmth is already around March and the temperature is almost 10 degrees. If the finished ink is suddenly dried naturally, it will break too quickly, so at first it is almost a month, so put the ink in the ash and dry the ash, but if you add too much, there is a possibility that mold will grow As there was, we decided to get out of the ash as soon as possible. Nature is an important factor in the manufacture of sumi.