Black inks are mixtures. In addition to water, the non-dye components (collectively referred to as the vehicle) might include polymeric resins, humectants to retard premature drying, pH modifiers, anti-foaming agents, biocides to prevent fungal and bacterial growth, and wetting agents (surfactants).
The composition of black inks involves a blend of water with additional non-dye components such as polymers, humectants, pH adjusters, anti-foaming agents, biocides, and wetting agents.