How to prepare cinnabar for drawing symbols
Synthesis method:
Put an appropriate amount of mercury into the reaction tank, add 1.3 to 1.4 times the amount (weight ratio) of nitric acid (specific gravity 1.4), and allow it to react naturally until there is no mercury. , dilute with double the amount of water, and while stirring, gradually add 1.21 times the amount of sodium sulfide containing crystal water or 0.7 to 0.8 times the amount of sodium sulfide aqueous solution calculated based on the amount of mercury until black mercury sulfide is completely generated. At the end of the reaction, the solution is controlled at pH 9 the following.
The black mercury sulfide is repeatedly washed 3 to 4 times with the pouring method, filtered with a bag, and the filtrate is dried. Add 4 amounts of sublimated sulfur, mix evenly, and heat to sublime to obtain purple-red massive mercury sulfide. , and then grind the mercury sulfide lumps into powder to become pure cinnabar.
Cinnabar, also known as cinnabar, cinnabar, red cinnabar, and mercury sand, is a natural ore of mercury sulfide (chemical name: HgS). It is bright red, has diamond luster to metallic luster, and belongs to the trigonal crystal system. The main component of cinnabar is mercury sulfide, but it is often mixed with realgar, apatite, asphaltene, etc. Extended information:
Cinnabar is also called cinnabar and cinnabar. The powder is red and can last for a long time. China has a long history of using cinnabar as a pigment. "Painting cinnabar on oracle bones" refers to grinding cinnabar into red powder and embedding it in the inscriptions on oracle bones to make it eye-catching. This practice has a history of thousands of years. .
The ruddy and bright colors are also loved by painters. Chinese calligraphy and painting are called "Danqing", in which "Dan" refers to cinnabar, the indispensable "Eight Treasures Ink Clay" in calligraphy and painting pigments. Its main ingredient is also cinnabar. China is also one of the countries that produces the most cinnabar in the world, and the market price of cinnabar has been rising in recent years. Reference: Baidu Encyclopedia-Cinnabar