Formalin

Formalin is a clear, strong-smelling liquid primarily composed of formaldehyde dissolved in water. It is widely used as a preservative to maintain the structure of biological specimens, such as plants, animals, and tissues, preventing decay and bacterial growth. In medical and scientific settings, formalin helps keep samples intact for study and diagnosis. While effective, it is also hazardous: exposure can cause health issues, so handling requires proper safety precautions. Overall, formalin is an important tool for preservation and research, balancing its usefulness with safety considerations.