Mention two important uses of sulphanilic acid.

Explanation

### Step-by-Step Solution:

1. **Identify the Compound**: The compound in question is sulphanilic acid, which can also be referred to as 4-amino-benzenesulfonic acid. Its chemical structure includes both an amino group (-NH2) and a sulfonic acid group (-SO3H).

2. **Understand the Properties**: Sulphanilic acid is unique because it contains both acidic and basic functional groups. The amino group can accept protons (H+), while the sulfonic acid group can donate protons, allowing it to exist in a zwitterionic form (a molecule with both positive and negative charges).

3. **List Uses**:
- **Use in Dyes**: One important use of sulphanilic acid is in the production of dyes, particularly for the textile and food industries. It acts as a precursor for various azo dyes, which are widely used for coloring fabrics and food products.
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