Phenol crystals are used to describe the solid forms that result from the phenol compound, which is also known as the carbolic acid. ... It is an extremely volatile white crystalline solid that is mildly acidic. It requires extremely careful handling because its structure can cause painful chemical burns.
Phenol (also called carbolic acid) is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile.