The term 'dark blue color' can be represented by two crossword solutions: COBALT (6 letters) and perse (5 letters). COBALT is a chemical element with the symbol Co and atomic number 27. It is a hard, lustrous, silver-gray metal that is found in various ores and used as a pigment for ceramics and glass. Perse is a deep, dark blue color that is often used to describe the night sky. It is also the name of a type of fabric, which is a lightweight woolen cloth with a soft texture.