What color does China blue refer to?

Chinese blue, also known as Prussian blue, Berlin blue, tribute blue, and iron blue, is composed of iron ferrocyanide, an ancient blue dye that can be used for glazes and oil painting dyes.

Related introduction: The uniform color of the Prussian army, the predecessor of Germany, was Prussian blue. Even after the establishment of the Second German Empire in 1871, Prussian blue uniforms were still used for a long time until the eve of World War I when they were changed to earthy gray.

It was not until 20 years later that some chemists understood what Prussian blue was and how to produce it.

Related background of extended information: In the 18th century, there was a German named Disbach. He was a worker who made and used paint, so he was interested in various colored substances.

Want to use cheap raw materials to make paint with good performance.

On one occasion, Disbach mixed plant ash and cow blood for roasting, then leached the roasted material with water. After filtering out the insoluble material, a clear solution was obtained. After the solution was evaporated and concentrated, a yellow color was precipitated.

crystal.

When Disbach put this yellow crystal into a solution of ferric chloride, a bright blue precipitate was produced.

After further experiments, Disbach found that this blue precipitate turned out to be a paint with excellent performance.