Which symptom characterizes an effective dye?

An effective dye is characterized by its ability to visibly absorb into the material being dyed. This absorption ensures that the dye is not merely resting on the surface but instead penetrates the fibers or substrate, resulting in a more permanent and vibrant color. When a dye effectively saturates the material, it enhances the overall appearance and durability of the color, leading to a richer visual effect that is integral for high-quality results in advertising design and other applications.

The absorption of the dye is crucial because it affects not only the color's intensity but also its resistance to fading and washing out over time. This deeper penetration means that the dye becomes an integral part of the material, allowing the finished product to maintain its aesthetic appeal under various conditions.