Prussian blue: Originally known as Prussian blue, it is the deepest and most stable color in blue. Slightly black, the hue is stable and calm, and it is widely used. The light blue blended by the Pulan powder is calmer and gentler than other light blues. With common blues and dark greens, it is also the most secluded and deep green. Also known as Berlin Blue, Gong Blue, Tie Blue, Miluoli Blue, Chinese Blue, Miloli Blue, Hualan. It is an ancient blue dye that can be used for glazing and oil painting. If red is positive forward and expansive, blue is introverted, retracted and cold. It is an unfathomable deep and serious color, which gives the feeling of contemplation, calm and openness, symbolizing reason, coolness, tranquility, and the sea.

The emergence of plain blue: There was a German named Diesbach in the 18th century. He was a worker who made and used paint, so he was interested in all kinds of colored substances. Always want to make good performance coatings from cheap raw materials. Once, Diesbach mixed plant ash and bovine blood for roasting, and then leached the roasted material with water, filtered out the insoluble material, and obtained a clear solution. After the solution was concentrated, a yellow color was precipitated. crystal. When Diesbach put the yellow crystals into a solution of ferric chloride, a bright blue precipitate was produced.

He felt it was a good opportunity to make money, so he kept the production method of the paint a secret and gave the pigment the elusive name Prussian blue in order to sell the paint at a premium price. It was not until 20 years later that some chemists understood what Prussian blue was and how it was produced. It turns out that plant ash contains potassium carbonate, and bovine blood contains two elements, carbon and nitrogen. When these two substances react, potassium ferrocyanide can be obtained, which is the yellow crystal obtained by Diesbach. It is made from bovine blood and is yellow crystals, so more people call it yellow blood salt. It reacts with ferric chloride to give ferric ferrocyanide, also known as Prussian blue.