Dye Inks use a colorant that is fully dissolved in the ink solution. Think of it like sugar dissolved in water: Once the sugar is dissolved, it will not settle out. For porous cardboard, dye-based ink is absorbed in the substrate. Dye-based inks produce bolder colors, but are less fade-resistant. Pigment Inks use small particles of colorants suspended in the ink solution. Think of it like natural orange juice: The pulp will settle, which is why the juice must be shaken. The pigments cure or dry on the surface of the cardboard. Pigment-based inks produce a narrower color gamut but are more fade resistant.