Do different brand black inkpens have the same ink component?

Different brands of black ink pens often have distinct ink formulations, which can vary in components such as dye, pigment, viscosity, and drying time. While some pens may use similar base ingredients, proprietary formulas and manufacturing processes lead to variations in performance, color saturation, and overall writing experience. Therefore, even if they appear similar, the ink components are typically not identical across brands.