Civil Engineering - Building Materials - Discussion

As we say wrought iron contain less carbon ie 0.1- 0.25 percent of carbon so how far it's a manufactured of wrought iron as what is white forge pig?

Pig iron is the intermediate product of smelting iron ore with a high-carbon fuel such as coke, usually with limestone as a flux. It is the molten iron from the blast furnace, which is a large and cylinder-shaped furnace charged with iron ore, coke, and limestone.

Charcoal and anthracite have also been used as fuel. Pig iron has a very high carbon content, typically 3.5-4.5%, along with silica and other constituents of dross, which makes it very brittle and not useful directly as a material except for limited applications.

What is the meaning of white forge pig?