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Discover Ludwig"deep blue" is correct and can be used in written English.
You can use "deep blue" to describe a dark color, or a color in between blue and black. For example: "The curtains were a deep blue color, complementing the navy blue walls perfectly."
Dictionary
deep blue
noun
Intense blue
Exact(54)
Deep Blue: I'm sorry.
Deep Blue Sea lipstick?
Deep Blue never played again.
Save the deep blue seas.
Those from Myanmar are deep blue.
Deep Blue: (vomits on chess board).
Similar(6)
All devices appeared excellent deep-blue emissions.
Deep-blue California supports the compact.
Mary's white dress is replaced with a deep-blue robe.
Far O'er the Deep Blue Sea.
Fucking Deep Blue Sea.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com