Crack cocaine is a hard, mineral-like substance with an off-white tint. Crack is made by mixing baking soda or ammonia into the powder form of cocaine. This mixture is then heated with a lighter or torch until it heats into the the “rocks” known as crack cocaine. It is most often vaporized in a glass pipe (often called a stem or rose because they are sold with a rose inside of them) and inhaled, though some people use soda cans or aluminum foil to heat it. Many users also inject crack.