Potassium Carbonate & Sodium Bi-Carbonate Solution (Lye Water)

What the brand says

Sold as “Potassium Carbonate & Sodium Bi-Carbonate Solution (Lye Water) - 6.5fl oz (Pack of 3)”

Koon Chun Sauce Factory Potassium Carbonate & Sodium Bi-Carbonate Solution (Lye Water / Kan Sui) in 6.5fl oz (190ml) bottle. Potassium carbonate is a white salt, soluble in water. Potassium carbonate is used in the production of soap and glass. Product of Hong Kong.