What is the black residue in crystal light?

Crystal Light is a brand of powdered drink mix that is sweetened with artificial sweeteners. The black residue that you may see in your Crystal Light drink is likely a result of the oxidation of the artificial sweeteners. Oxidation is a chemical process that occurs when a substance comes into contact with oxygen. When artificial sweeteners are exposed to oxygen, they can oxidize and turn brown or black.

The black residue in Crystal Light is not harmful to consume. However, it may affect the taste of your drink. If you are concerned about the black residue, you can try to reduce it by storing your Crystal Light mix in a cool, dark place. You can also try mixing your Crystal Light with cold water instead of hot water.