The process of vulcanization was introduced by ……………………

Explanation

**Step-by-Step Solution:**

1. **Understanding Vulcanization**:
- Vulcanization is a chemical process that improves the properties of rubber. It involves the addition of sulfur to natural rubber, which enhances its durability, elasticity, and resistance to various environmental factors.

2. **The Chemical Reaction**:
- During vulcanization, sulfur atoms form cross-links between the long chains of rubber molecules. This cross-linking occurs at the double bonds present in the rubber, which transforms the rubber into a more robust material.

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