The Fire Starter can be used to ignite the several types of fires in TerraFirmaCraft, including Firepits, Charcoal Pits, and Pit Kilns. When lighting these, the Fire Starter may require several uses to successfully ignite the fire, and depending on random chance more than one fire starter may be necessary.
In addition, the Fire Starter can activate a Bloomery or Blast Furnace. This will always be successful if the requirements are met. "Note: Right-clicking a fire starter on any surface will be interpreted as an attempt to start a fire pit and will fail, consuming durability."