The phrase "a darker blue" is correct and usable in written English.
It can be used when describing a shade of blue that is deeper or more intense than another shade.
Example: "I prefer a darker blue for the walls of my living room to create a cozy atmosphere."
Alternatives: "a deeper blue" or "a more intense blue".
From inside the arena bowl, the only noticeable difference is the new seats in the lower section, which are larger and cushier and a darker blue color.
Later a darker blue was substituted and, in the period 1967 74 when Greece was under a military junta, a very dark blue was official.
This job took only about an hour, both because the door needed only minimal prep work and because I could skip the primer — I was painting a darker blue over a lighter blue.
"I prefer a darker blue, maybe even the purple," said Kim Clijsters, who has won the last two United States Opens and this year's Australian Open, all on deep-blue hardcourts.
He said his wife, who had helped select Mr. Malvo's wardrobe, was unhappy with a report in The New York Times that mentioned the Monday sweater, a darker blue with silver stripes.
With its big round navigation wheel and spring-loaded stylus, it's a little more up-to-date in the industrial design department than the more traditional-looking Cassiopeia EM-500, which comes in silver and five colors of plastic: green, yellow, sky blue, a darker blue and red.
The most immediately apparent aesthetic change is the color, which switched from Stormtrooper black and white to a darker blue-black.
pIndigoBAC536 has the internal Eco R1 site of pBeloBAC11 destroyed so that the unique Eco R1 site in the multiple cloning sites can be used for cloning, and also contains a random point mutation in the lacZ gene that provides colonies with a darker blue-color on X-gal/IPTG selection.
Inside, the walls are a dark blue.
The elegant smudges of a dark blue roller ball pen.
B minor, he said, is "sort of a dark blue".
