This alchemical oil can coat one weapon or up to 12 pieces of ammunition. Applying the oil takes 1 minute. For 1 hour, the coated item is magical and deals 1d6 bonus fire damage on a hit. 

Fire Oil. This red-orange, slippery oil sparkles with flecks of gold and produces a sulfurous smell when used. A coated item bursts into flame when it is moved quickly, such as when it is used to make an attack, and ignites if it is flammable.