There are two variants of lead oxide: a red Square crystal, also known as a tantric Monk. The other is a yellow orthogonal crystal, also known as lead yellow, Density: 8.0 g/cm 3. The transition point of both is 488.5°c, lower than the temperature, the conversion is Slower. Both are difficult to dissolve in water. Lead oxide can be dissolved in acid, but also slightly soluble in alkali solution.
Under heating, lead oxide is easy to be reduced to metal lead by hydrogen, Carbon and Co.