Types of deinking agents are differentiated by chemical function, each addressing specific challenges in the ink‑removal workflow. Surfactants (anionic, non‑ionic, and amphoteric) constitute the core of most formulations, lowering surface tension to detach ink particles; they dominate the market due to versatility across paper grades. Bleaching agents such as hydrogen peroxide and sodium hypochlorite provide oxidative degradation of colorants, essential for achieving high brightness in newsprint and packaging streams. Chelating agents (e.g., EDTA, phosphonates) bind metal ions that catalyze ink adhesion, thereby enhancing overall cleaning efficiency. Polymers—including polyacrylamides and starch derivatives—act as flocculants, aggregating ink particles for easier removal and improving sludge handling. Finally, Enzymatic additives (lipases, cellulases) are emerging for specialty applications, offering selective ink breakdown with minimal fiber damage. The proportional adoption of these types reflects process economics, environmental regulations, and end‑product specifications, forming the backbone of the market taxonomy for deinking agents.