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Discover Ludwig"royal blue" is correct and usable in written English.
You can use it to refer to a deep, saturated shade of blue the color of a bright summer sky. For example: I painted my bedroom walls a beautiful, royal blue.
Dictionary
royal blue
noun
A deep, bright blue colour.
synonyms
Exact(56)
Who? Royal blue?
They come in black and royal blue.
Royal blue £55, by Hobbs.
Royal blue tiles adorned the locker rooms.
Her wedding dress is made of royal blue velvet.
And all of them have the bright, royal blue tips.
Clifford wore a royal blue sports jacket with gold buttons.
Similar(4)
A glimpse of royal-blue brushed-leather tennis shoes.
Why must Joby dress in royal-blue vinyl, say, with his hair in a silly coif?
The royal-blue plastic tarps covering the stalls appeared nearly black, like funeral shrouds.
"This stuff is pretty rough," he said, lacing up a pair of royal-blue deck shoes.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com