Design an industrial advertising poster showcasing "Carbon Black". Display three different packages side by side, each labeled with its grade: N220, N330, and N550. Each package should also show its weight (20kg, 25kg, 30kg) and a price tag below it. Use a clean industrial style with dark colors (black, gray, and a touch of industrial blue). Add a bold headline at the top: "Special Sale – Carbon Black in 3 Grades". The layout should look professional, modern, and suitable for marketing on social media or brochures. Font should be sharp, modern, and easy to read. See more