The color matching of Klein blue

Quick answer：

Klein blue is a deep, electric blue pigment created by German chemist Paul H. Klein in the early 20th century. It is known for its vibrant and intense color. When pairing Klein blue with other colors, it often complements warm tones like reds and oranges, and contrasts well with cool tones such as greens and purples. The color is often used in art and design to create a striking visual impact.