Product Description Ink sticks are a practical choice for producing liquid sumi-e ink. These sticks are made with a natural binder combined with soot and other carbon materials, making them ideal for black and white work, writing, calligraphy, and texts. However, they are not suitable for painting or achieving a wide range of grays. To maintain their quality, avoid mixing them with liquid inks or synthetic binders, dry them after each use, and keep them away from moisture, as prolonged humidity can cause cracking.