Sodium oxalate
From PyroGuide
Formula: Na2C2O4
Synonyms: Disodium oxalate
Description: Sodium oxalate is mainly used for making yellow to golden colors in composition. It is also used for delay agent in some glitter compositions.
Hazards: Sodium oxalate is harmful by skin contact, ingestion and inhalation. Use proper safety gear when working with sodium oxalate, such as latex gloves, goggles and a dust mask.
Sources: Various pyro supplies. Sodium oxalate can also be made at home using oxalic acid and a sodium salt.