What is denatured alcohol ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Denatured Alcohol**: Denatured alcohol is essentially ethyl alcohol (ethanol) that has been treated to make it unfit for human consumption.

2. **Purpose of Denaturing**: The primary reason for denaturing alcohol is to prevent its misuse as a beverage. By making it undrinkable, it can be supplied at a lower tax rate for industrial use.

3. **Additives Used**: To denature alcohol, certain poisonous substances are added. Common additives include:
- **Methanol**: A toxic alcohol that can cause blindness or death if ingested.
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