A photo depicting Igorot blacksmiths using a manual forced-air furnace used for smelting and forging. The two cylindrical drums are actually manual air pumps that send air into a into the furnace.

This technology allowed the Igorots to heat iron for smelting. Some iron blades made in this process can also attain steel properties. This Igorot technology is a direct copy of the Malay forge or "bulusan".

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