Product Information. [C6H10O5] Light yellow powder. Dextrin is a water-soluble binder used in fireworks: for stars, comets, and granulating black powder. Also sometimes used as a glue. Solvent is water. Other fireworks binders are used as well.See alternatives on the left.C6H10O5] Light yellow powder. Dextrin is a water-soluble binder used in fireworks: for stars, comets, and granulating black powder. Also sometimes used as a glue.