Chinese traditional cobalt blue picture

Quick answer：

Traditional cobalt blue, also known as Chinese blue, is a vibrant blue pigment used in Chinese art and ceramics. It was developed during the Tang Dynasty and has been used for centuries. The pigment is derived from natural sources, such as cobalt ore, and is known for its durability and vibrant color. It is particularly famous for its use in blue and white porcelain, where it contrasts beautifully with the white ceramic body.