Definition

1. Noun:
   • A greenish-blue pigment: A specific inorganic pigment made primarily from cobalt oxide and alumina, known for its vibrant, stable color used in art and industry.
   • A shade of blue tinged with green: The color itself, a distinctive blue with a greenish undertone, resembling the pigment.

Examples

• Noun:
  • The artist mixed cobalt blue with white to paint the sky. (The artist used the specific pigment to create a sky color.)
  • She painted her front door a beautiful cobalt blue. (She painted her door that particular shade of greenish-blue.)

Advanced Usage

• As a color descriptor: Used attributively to describe objects of this specific hue.
  • The designer chose a cobalt blue fabric for the accent chair. (The fabric color is that specific greenish-blue.)

Variants and Related Words

• Cobalt: (Noun) The metallic chemical element (Co) from which the pigment is derived.
• Cerulean blue: (Noun) A different blue pigment and color, often compared to but distinct from cobalt blue.

Synonyms

• Azure: A bright blue color, like a clear sky, but typically without the greenish tinge.
• Cerulean: A sky-blue color, sometimes with a slight greenish hint, but generally lighter than cobalt blue.

Notes

• The term "cobalt blue" specifically refers to the synthetic inorganic pigment (cobalt aluminate) and the color it produces. It is not typically used for naturally occurring blue gemstones, which are usually referred to by names like "cobalt-blue spinel."

Noun

1. greenish-blue pigment consisting essentially of cobalt oxide and alumina
2. a shade of blue tinged with green