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How did Sir Humphry Davy independently isolate boron?

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A labeled diagram of the periodic table entry for boron shows its atomic number 5, symbol B, electron configuration, atomic weight range, and classification as a solid, weakly acidic, other nonmetal with a rhombohedral crystal structure at room temperature. — boron Properties of boron.

In 1808, the British chemist Sir Humphry Davy independently isolated boron by heating boron oxide (B₂O₃) with potassium metal.12

This process resulted in the production of an impure, brownish-black amorphous powder, which remained the only known form of the element for more than a century. Davy’s discovery occurred during the same year that French chemists Joseph-Louis Gay-Lussac and Louis-Jacques Thenard independently isolated the element using a similar chemical reduction method.13