The melting point of lead tetroxide is 500 °C, at which it decomposes to lead(II) oxide and oxygen. Chemically red lead is lead tetroxide, Pb3O4, or 2PbO.PbO2. It is used in the manufacture of batteries, lead glass and rust-proof paint. Red lead is virtually insoluble in water. However, it is soluble in hydrochloric acid present in the stomach, and therefore it is toxic when ingested. It is also insoluble in alcohol. It dissolves in hydrochloric acid, glacial acetic acid, and diluted mixture of nitric acid and hydrogen peroxide.
The melting point of lead tetroxide is 500 °C, at which it decomposes to lead(II) oxide and oxygen. Chemically red lead is lead tetroxide, Pb3O4, or 2PbO.PbO2. It is used in the manufacture of batteries, lead glass and rust-proof paint. Red lead is virtually insoluble in water. However, it is soluble in hydrochloric acid present in the stomach, and therefore it is toxic when ingested. It is also insoluble in alcohol. It dissolves in hydrochloric acid, glacial acetic acid, and diluted mixture of nitric acid and hydrogen peroxide.