Which form of copper is called blister copper ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Term "Blister Copper":**
- Blister copper refers to a specific form of copper that is produced during the smelting process.

2. **Formation Process:**
- During the smelting of copper ores, the metal is extracted and undergoes a process where it is heated in the presence of a flux. This process leads to the release of gases, particularly sulfur dioxide (SO2).

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