Deep, rich blue, like the pigment made from the metal.
Cobalt is a deep blue.
It can be described as deep, rich, dark and dim.
Set in white, because white reads best on it.
Cobalt is a chemical element; it has symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, somewhat brittle, gray metal.
Read on WikipediaCobalt is an action side-scrolling video game developed by Oxeye Game Studio and published by Mojang Studios. It was released on February 2nd, 2016, for Microsoft Windows, Xbox 360 and Xbox One.
Read on WikipediaCobalt blue is a blue pigment consisting principally of cobalt(II) aluminate, CoAl2O4, made by sintering cobalt(II) oxide with aluminium(III) oxide (alumina) at high temperatures. It is used as a ceramic color, in automotive and industrial coatings, in scientific and medical imaging, and as a fine-art pigment. Its thermostability, chemical inertness, and lightfastness make it suitable for applications requiring a durable blue color.
Read on WikipediaProper noun