In medieval India, the process of indigo extraction underwent great improvement as a result of the:
- A. use of fertiliser enhancing the quality of indigo crop.
- B. introduction of mechanical crushing tools for indigo stems.
- C. use of gypsum and lime mortars in making the inner surfaces of indigo vats water-proof. ✓
- D. employment of slave labour in quick distilling of indigo curcibles.
Correct Answer: C. use of gypsum and lime mortars in making the inner surfaces of indigo vats water-proof.
Explanation
The use of lime and gypsum mortar provided a waterproof lining for vats, which was a significant technological improvement in the large-scale extraction of indigo dye.
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