Pig Iron is an intermediate step in a way to get more iron from ore.
Pig iron is a mottled dark tan in color but otherwise resembles most other ingots.
Pig iron must be crafted on an electric furnace.
Pig iron is used to make iron ingots on an electric furnace.
It also can be used to create black sand in a press.
In the real world, pig iron is a very brittle, intermediate step in the production of various types of iron or steel. It was named because the traditional casting method was likened in appearance to piglets suckling on a sow.