Petroleum 1X (Q) (30ml)Petroleum(Mother Tincture) Trituration and tincture of the rectified oil is used as a medicine. This is a highly carbonaceous oil but it is not a pure carbon Common Name: Oleum petrae, Rock oil, Coal Oil Causes & Symptoms for Petroleum Eczema, forming thick scabs and oozing pus indicates Petroleum. sprains of joints, especially in old, when the knees are stiff, associated with sharp sticking pains, cracking sound is relieved. Scabs and purulent mucus