Basic copper carbonate CuCO3·Cu(OH)2 is commonly known as patina. Alias ​​bronze. It is a light green fine particle or an amorphous powder, which is the main component of copper to produce copper rust in the air. This powder is toxic, unstable and decomposes at 473K (200 ° C): CuCO3·Cu(OH)2=2CuO+CO2↑+H2O After decomposition, it turns into black copper oxide. Insoluble in water but soluble in acid to form the corresponding copper salt. Malachite CuCO3·Cu(OH)2+4H=2Cu2+CO2↑+3H2O In addition, it can also be dissolved in cyanide or ammonium salts to form complex ions which are soluble in water. It is obtained by mixing with two solutions of sodium hydrogencarbonate and copper sulfate, filtering and drying (low temperature). The main application of patina is pyrotechnics, paints, and phosphate poisoning agents. source The copper is oxidized after being dampened in the air, the green basic copper carbonate produced on the surface, or the processed product of the indigo (ie, basic copper carbonate) and the gypsum plaster mixed with water and pressed into a flat block and the natural malachite. Medicinal products are mostly processed products. System of law The naturally occurring patina is scraped off with a magnetic sheet or a wire cutter. Process for the processing of finished products: Mix the patina powder or indigo with the gypsum powder, add water and mix well, press into a flat block, spray it with sorghum wine, the surface will show green, cut into small pieces, and dry. In ancient times, patina was the rust of copper. It can be sprayed on copper with vinegar to accelerate the formation of green rust, which is obtained by scraping. Laboratory method: pour copper sulfate and sodium carbonate into the boiling water and stir for about 10~15 minutes (not too vigorous boiling, a little bubble can emerge, avoid copper sulfate from forming copper oxide) Filtered precipitation CuSO4+2Na2CO3+H2O=Cu2(OH)2CO3+2Na2SO4+CO2↑ Traits The naturally occurring patina is powdery or irregular, and is cyan. The quality is loose, the taste is slight, and the fire is burning green. The other processed product is a small rectangular piece with a firm and easy to break, three layers with obvious sections, the upper layer is a thin blue layer, the middle layer is white, and the bottom layer is grayish yellow. It is odorless, tastes light, and has a sandstone feel. Sexual taste Bitter, sour, sputum, cold. poisonous. Indications Detoxification, detoxification, insecticide. Topical treatment of nasal meat, eye smashing, sores and stubborn. Dosage This product is generally used for external use. Internal medicine is often assigned to the corresponding prescription for the treatment of wind sputum, sudden fainting and blood gas heart pain embolism, the amount of 0.5 ~ 1 money. - Excerpted "National Chinese Herbal Medicine Compilation" Cotton Stretch Poplin Printed Fabric Elegant Design Fabric,Men'S Casual Pants,Poplin Printed Fabric,Reactive Printing Fabric SHAOXING CITY CHENYAO TEXTILE CO,LTD , https://www.chenyaotextile.com