Urea is a compound with the formula CO(NH2)2. It is a white, crystalline solid that is highly soluble in water. Urea is the main nitrogen-containing substance in the urine of mammals and is also found in high concentrations in the feces of birds and reptiles. Urea is used as a fertilizer and as a source of nitrogen in animal feed. When urea is treated with an acid, it forms a salt called urea nitrate, which has a crystal effect.
Urea nitrate crystals are often used in demonstrations of crystallography and as a fertilizer. They are also used in the production of fireworks and explosives. Urea nitrate crystals are not particularly toxic, but they can be irritating to the skin and eyes.
