Is 15 year old food coloring safe?

Using 15-year-old food coloring is not recommended, as its safety and effectiveness can be compromised over time. While food coloring doesn't spoil in the same way perishable foods do, it may lose potency and could potentially develop contaminants. It's best to check for any unusual odors, colors, or textures before use, and when in doubt, it's safer to replace it with fresh food coloring.