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Hypoallergenic applications of niobium: medicine and jewellery

Niobium and some niobium alloys are physiologically inert and thus hypoallergenic. For this reason, niobium is found in many medical devices such as pacemakers.[69] Niobium treated with sodium hydroxide forms a porous layer that aids osseointegration.[70]
Along with titanium, tantalum, and aluminium, niobium can also be electrically heated and anodized, resulting in a wide array of colours using a process known as reactive metal anodizing which is useful in making jewelry.[71][72] The fact that niobium is hypoallergenic also benefits its use in jewelry.[73]

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