Disodium pyrophosphate

Disodium Pyrophosphate or Sodium Acid Pyrophosphate is a buffering and chelating agent used in canned seafood, as a scald agent in poultry and pork, as a sequesterant in potato products, and is used to aid leavening in baked goods.

Other uses
In leather treatment it can be used to remove iron stains on hides during processing. It can stabilize hydrogen peroxide solutions against oxidation. It can be used for cleaning with sulphamic acid in some dairy applications. In Petroleum production, it can be used as a dispersant in oil well drilling muds.