In leather processing, the unhairing process involves the use of chemicals that break down the proteins in hair follicles. Sodium sulfide is the primary chemical used for this process, as it efficiently breaks down keratin, the protein in hair, making it easier to remove.
Step 1: Role of Sodium Sulfide
- Sodium sulfide is an effective reagent in breaking down the keratin in hair, helping to loosen the hair from the hide.
- Other chemicals like calcium hydroxide and hydrogen sulfide are not commonly used for hair removal, while calcium carbonate is generally used for pH regulation, not unhairing.
Step 2: Conclusion
Therefore, the correct chemical for hair removal is Sodium Sulfide (Option B).