Usage patterns
〈物〉をコバルトブルーに塗るto paint something cobalt blue
I painted the wall cobalt blue.
コバルトブルーの〈物〉a cobalt-blue colored thing
She was wearing a cobalt-blue dress.
コバルトブルーに染まるto be dyed / tinged cobalt blue
The evening sky was tinged cobalt blue.
