- Winsor & Newton Cotman Watercolor Tube 21 ml in Smoke Black color - Made with selected pigments for intense and consistent tones - High permanence (AA) and opacity, suitable for long-lasting works - Complies with ASTM D4296 standard, ensuring safety and quality - Series 1, color code 337, color index PBk7, PBk6 - Ideal for professional and amateur watercolor techniques - Easy to mix, apply, and work on different surfaces - Leading brand in fine art materials, recommended by artists - Practical tube presentation for dosing the necessary amount