What is the purpose of using alum in dyeing of cloth?

Explanation

To answer the question, "What is the purpose of using alum in dyeing of cloth?" we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding Natural Dyes**:
- Natural dyes do not easily adhere to cotton fabrics. This is an important point to note as it sets the stage for why alum is necessary.

2. **Role of Alum**:
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