How will you prepare colloidal solution of gold ?

Explanation

To prepare a colloidal solution of gold, follow these steps:

### Step-by-Step Solution:

1. **Prepare Gold Chloride Solution**:
- Start with a solution of gold chloride (AuCl₃). You can prepare this by dissolving gold in aqua regia (a mixture of hydrochloric acid and nitric acid) or by using commercially available gold chloride.

2. **Prepare Stannous Chloride Solution**:
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