Ammonium sulfite

The most common food product with ammonium sulfite is caramel coloring E150d.

According to the FDA, caramel coloring contains ammonium, potassium, or sodium sulfite.

The bricks made using ammonium sulfite are mainly used for blast furnace linings.

[8] Ammonium sulfite can be included in lubricants for cold metal working.

The lubricants are intended to reduce friction to keep heat production down and keep impurities out of the metals.

Ball-and-stick model of two ammonium cations and one sulfite anion
Ball-and-stick model of two ammonium cations and one sulfite anion
NFPA 704 four-colored diamond Health 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g. chloroform Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code