What type of container is suitable for storing evidence of flammable liquids?

The correct answer is a glass or metal container because these materials are non-permeable and can securely contain flammable liquids, minimizing the risk of leakage or vapors escaping into the environment. Glass is inert, meaning it won't react with the chemicals in the liquids, and it provides excellent visibility for inspection. Metal containers also offer durability and are designed to withstand pressure, making them suitable for storing volatile substances.

Other materials such as plastic may not provide the same level of protection against chemical interactions or potential degradation over time, which could lead to leaks. Wooden containers are porous and can absorb liquids, which poses a safety hazard as flammable substances may seep out and create fire risks. Cardboard boxes are not appropriate for hazardous materials since they can be easily compromised by liquids and do not provide a secure seal against vapors. Thus, glass or metal containers are the best choice for safely storing evidence of flammable liquids.