What is methylated spirit or denatured alcohol?

Explanation

### Step-by-Step Solution:

1. **Definition of Denatured Alcohol**: Denatured alcohol refers to ethanol (ethyl alcohol) that has been mixed with certain substances to make it unfit for human consumption. This process is done to avoid the taxation that is applied to alcoholic beverages.

2. **Components of Denatured Alcohol**: Ethyl alcohol is mixed with various poisonous substances to create denatured alcohol. Common additives include:
- **Pyridine**: A toxic organic compound that is used as a solvent and in the synthesis of various chemicals.
- **Copper Sulfate**: A blue crystalline solid used in agriculture and as a fungicide.
- **Methanol**: A type of alcohol that is toxic and can cause blindness or death if ingested.
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