A burnished or polished surface finish on metal, particularly on armor or decorative metalwork, that gives it a lustrous brown-gold appearance.
From French 'brunir' (to burnish) plus '-ure' (a noun suffix). The term comes from the metalworking process of smoothing metal surfaces with stones or tools to create a reflective, darkened finish.
Brunissure represents medieval metallurgical science—armorers discovered that burnishing not only made armor beautiful but actually work-hardened the metal surface, making it more dent-resistant, so beauty and function were literally created together.
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