PbCrO42

Lead(II) chromate, chemical formula PbCrO4, is an inorganic compound. It appears as a bright yellow crystalline solid. It is insoluble in water but soluble in acids. Historically, lead(II) chromate was known as chrome yellow and was widely used as a pigment due to its vibrant color. This pigment was utilized in paints, ceramics, and even in coloring paper and plastics.

The production of lead(II) chromate typically involves the reaction of lead(II) nitrate with potassium dichromate or sodium chromate in an aqueous solution. The insoluble lead(II) chromate precipitates out and can then be filtered and dried. The specific shade of yellow can be influenced by the precise conditions of precipitation, such as temperature and pH.

Despite its useful properties as a pigment, lead(II) chromate is now recognized as a toxic substance. Both lead and chromium(VI) compounds are hazardous. Lead is a heavy metal that can cause neurological damage, developmental problems, and other health issues. Chromium(VI) is a known carcinogen and can also cause respiratory and skin irritation. Due to these health concerns, the use of lead(II) chromate as a pigment has been significantly restricted or banned in many countries. Safer alternatives have largely replaced it in commercial applications. Environmental regulations also address the disposal and handling of materials containing lead(II) chromate.