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25 Euros Faszination Licht
| Issuer | Austrian Mint (Münze Österreich) |
|---|---|
| Year | 2008 |
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| Technique | Milled |
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| Obverse description | The silver outer ring displays a detailed architectural view of the Vienna City Hall (Rathaus) rendered in fine relief, with radiating sunburst lines emanating from the green niobium centre. The legend REPUBLIK ÖSTERREICH arcs along the upper periphery of the silver ring, while the denomination 25 EURO and the date 2008 appear in the lower field. The niobium centre core, tinted in a characteristic iridescent green, depicts beams of light projecting onto the Rathaus facade, evoking the theme of artificial illumination. |
|---|---|
| Obverse script | Latin |
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| Additional information |
Austria's niobium bimetallic series, launched in 2003, was among the first in the world to exploit niobium's capacity to take on different colors through anodization — an electrolytic oxidation process that varies the oxide layer thickness to produce specific wavelengths of reflected light. The 2008 "Fascination with Light" issue used a blue anodization to evoke visible light itself, a choice that required precise voltage control during production; niobium anodization is notoriously sensitive, with small deviations producing measurable color drift across a batch.
Annual mintage was capped at 65,000 pieces.