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Blue

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Blue is a colour, the perception of which is evoked by light having a spectrum dominated by energy with a wavelength of roughly 440–490 nm. It is considered one of the additive primary colours. On the HSV Colour Wheel, the complement of blue is yellow; that is, a colour corresponding to an equal mixture of red and green light. On a colour wheel based on traditional colour theory (RYB) where blue was considered a primary colour, its complementary colour is considered to be orange (based on the Munsell colour wheel). In Modern English, "blue" is one of the basic colour terms, and one of the seven spectral colours, intermediate between violet (purple) and cyan. It comprises a considerable number of identifiable subcategories that can be identified with descriptive terms like navy blue (a dark blue), cyan blue (or "blue-green", on the boundary to the green range), or sky blue (azure). The word itself was loaned into Middle English from the Old French word bleu, blo " "pale, pallid, discoloured; blue, blue-grey", itself from an Old Frankish *blao.
Reference: Wikipedia.

San Lucar de Guadiana Student Village Bunratty Castle, Co. Clare
Dunguaire Castle Killaloe Abbey Augustinian Friary
Ennis Abbey City Lights Moonlit Clarion
Millennium Bridge Little Angel Jonkoping Bridge
Cool Blue St. Finbarr's Cathedral Madre de las Marismas
Stockholm Harbour Lycabettus Hill St. Finbarr's Cathedral
Blue City at Night Blarney Woolen Mills Coconut Tree
City Hall Grainneuaile's Castle Catedral de Santiago de Compostela
Frozen Lake USS Monterey, CG-61 Cool Blue
Tomales Bay Tallest Christmas Tree 4 Freezing Fog
Christmas Tree Thomond Student Village Shannon River
Doolin Harbour Doughmore Dusk Atlantic Rain Storm
Carnaby Street Sarsfield Bridge Winter Evening 2
Rising Tide lifts all Boats Doughmore Beach Peru Rail
Peek-a-Boo Llama Ladies Sarsfield Bridge
Atlantic Waves Doughmore Beach - after Sunset Blue Water
Rain Storm Rain Storm Winter Evening
Flotsam or Jetsam? Blue Umbrella Doughmore Beach - Sunset
Mike & Linda's House Shipping Lane Burren Reflections 3
Beach-Chairs for Rent Wood Carving Celebrating Victory
Horseman, pass by! Sarsfield Bridge Thomond Bridge & King John's Castle
Falling Tide - Curragower Falls Cloth Seller Blue Hour
The Guesthouse Just Checking Ocean Spray
Audience with the Chief Tower Bridge at Night Old Pier
Pre-Dawn Blue-Hour Jurassic Coast - Ballard Downs Tower Bridge 4
Blue Footed Booby Mutton Island Atlantic Coast
Mutton Island 2 Doolin Harbour 2 Atlantic Storm
Spanish Point Evening Light Crepuscular - Lough Derg
Tuff Cone Atlantic Storm Atlantic Storm
High-Tide Coaching Atlantic Storm Lough Derg
Limerick Skyline Storm Approaching Limerick Skyline 3
Reflections at Dusk Ballydonegan Bay T'was a dark and stormy night ...
Atlantic Coast Ballydonegan Bay Copper Coast
Blue Hour Dreaming Ink Blot Evening Easter Waves
Cuban Taxi Chevrolet Buick Taxi
Son et Lumiere Dreamtime Dreamtime 2
I'm late, I'm late! Penguin Rock Blue Icebergs
Blow-Hole Geyser Pool Cuban Flag
Waterville Blue Icebergs Back-Packer
Lilac Breasted Roller (Coracias caudatus) Blue Hour Shannon River in Flood
Vatnajökull – Glacier of Rivers Blue Icebergs New Holland Tractor
Blue Icebergs Whalewatching Vatnajökull – Glacier of Rivers
Fordson Major Blue Restaurant Blue Lagoon
Blue Icebergs Blue Lagoon Bluebells
Causeway Bluebells Blue Icebergs
Blue Pool Bank Worker Maritime Medley
Katwe Crater - Salt Lake