No, pigment inks are not completely waterproof, but they are significantly more water-resistant than dye-based inks.
Understanding Pigment Ink Water Resistance
Pigment inks get their color from insoluble pigments suspended in a liquid carrier. This is key to their water resistance. Unlike dye inks, which absorb into the paper, pigment inks sit on top of the paper's surface. This means water is less likely to penetrate and dissolve the color.
However, "water-resistant" doesn't equate to "waterproof." While pigment inks resist smearing and fading from water exposure better than dye inks, prolonged or excessive submersion in water can still lead to some color bleeding or running. The level of water resistance also depends on factors like:
- The specific pigment ink: Formulations vary, and some are more water-resistant than others.
- The paper type: Porous papers absorb more water, potentially affecting the ink's resistance.
- The amount of ink applied: Heavier ink applications generally provide better water resistance.
Advantages of Pigment Ink Water Resistance:
- Smudge-proof printing: Pigment inks are ideal for applications where smudging is a concern, like important documents or photographs.
- Archival quality: Their superior water resistance contributes to their longevity and archival properties.
- Crisp, vibrant colors: The pigment particles produce bolder, more saturated colors compared to dye inks. (As noted in the reference provided, they also create a truer black).
Example: A pigment ink drawing might withstand a light rain shower, but it wouldn't survive a prolonged soak in water.
