Is it safe to use old aluminum foil for storage purposes?

It is generally not recommended to reuse old aluminum foil for storage purposes. Reused foil can accumulate bacteria and may even tear, leading to food contamination. Additionally, the foil's integrity and effectiveness as a barrier can be compromised with use, potentially allowing air and moisture to reach the food, which can spoil it faster. For food safety and quality, it's best to use fresh aluminum foil each time.