Can you reuse charcoal that has not burned completely to ash?

Yes, you can reuse unburned charcoal, though with some caveats. Here are some points to consider:

1. Safety Concerns: Make sure the charcoal pieces you plan to reuse are completely extinguished before storing or reusing them. Hot or smoldering charcoal can pose a fire hazard if mishandled.

2. Reduced Efficiency: Reused charcoal may not burn as efficiently or produce the same level of heat as fresh charcoal. This is because the combustion process during the initial burning has already consumed some of the combustible materials.

3. Flavor: If you're using charcoal for grilling, reusing it may impart a different or stronger flavor to your food compared to fresh charcoal.

4. Ash Content: Reused charcoal may have a higher ash content, which can affect its performance and contribute to the buildup of ash in your grill or fireplace.

5. Storage: Store unused charcoal in a dry and covered container to prevent moisture from entering. Reused charcoal may be more susceptible to moisture absorption, which can further affect its burning properties.

Overall, while you can reuse unburned charcoal, be aware of the potential impacts on its efficiency, performance, and the overall grilling experience. It's best to use a combination of fresh and reused charcoal for optimal results.