When working with lye (sodium hydroxide), it's particularly dangerous to mix it with any acidic substances, as this can cause vigorous exothermic reactions, producing heat and potentially hazardous fumes. Some common examples include:
1. **Acids**: Mixing lye with acids (like sulfuric acid, hydrochloric acid, or vinegar) can lead to violent reactions that generate heat and may result in splattering or injury.
2. **Water**: Although lye is often