The front of the banknote
Under UV light, red, blue and green fibres appear. Various parts of the note glow in green and orange. The paper itself remains dark and does not glow in blue.
The back of the banknote
Under UV light, the bridge, the number 5 and the map glow in yellow.
Note: Counterfeit notes with UV imitations are hard to distinguish from genuine notes if you use a UV lamp. Also use the look, feel and tilt method to check the authenticity of a euro banknote.