D. Torrejano India ink is based on shellac and carbon black, suitable for writing and washes, and can be applied as a background for scratch paper and diluted with water to create warm shades of gray over the ink. The quality of D. Torrejano India ink is unalterable regardless of the working method. It offers good resistance to water and light, excellent fluidity under the pen, and great flexibility. All colors are transparent, except black (shake well before use), and mix well. Once dry, they are indelible, and several layers of ink can be superimposed. D. Torrejano India ink achieves a very intense black when used pure.