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The article contains sections titled: 1. Introduction 2. Dye Solubilizing and Hydrotropic Agents 3. Dye Protecting Agents and Boildown Protecting Agents 4. Wetting and Deaerating Agents 5. Dispersants and Protective Colloids 5.1. Dispersants in Dye Production 5.2. Dispersants for Dyeing (Batch and Continuous Processes) 5.3. Testing 6. Complexing Agents 7. Levelling Agents 7.1. Levelling Agents for Dyeing Cellulose Fibers 7.2. Levelling Agents for Wool Dyeing 7.3. Levelling Agents for Dyeing Polyamide Fibers 7.4. Levelling Agents for Dyeing Polyester Fibers 7.5. Levelling Agents for Dyeing Polyacrylonitrile Fibers 7.6. Levelling Agents for Dyeing Other Synthetic Fibers and Fiber Blends 7.7. pH Regulators (Acid‐ and Alkali‐Releasing Agents) 7.8. Testing 8. Dyeing Accelerants (Carriers) 9. Anticreasing Agents 10. Auxiliaries for Continuous Dyeing 10.1. Antimigration Agents 10.2. Antifrosting Agents 10.3. Products to Increase Liquor Uptake 11. Aftertreatment Agents to Improve Fastness 12. Reducing Agents 13. Oxidizing Agents 14. Stripping Agents 15. Resist Agents for Dyeing and Printing