What is Patina

Many people may not know much about verdigris. In fact, verdigris is not copper, but a very precious mineral gem. It belongs to alkaline carbonate, a kind of salt. It also has good medicinal value. It can effectively kill insects and stop bleeding. It is also very effective in relieving the phenomenon of female qi and blood heartache. However, the use of verdigris must not be blindly avoided to avoid poisoning or adverse reactions.

Verdigris is not produced by any copper. Verdigris, with the chemical formula Cu2(OH)2CO3, also known as malachite (the main component is Cu2(OH)2CO3, not a pure substance), is a precious mineral gemstone, an alkaline carbonate, and a type of salt. It is a substance produced by the reaction of copper with oxygen, carbon dioxide, water and other substances in the air, also known as copper rust (patina). When heated in air it decomposes into copper oxide, water and carbon dioxide. Verdigris (copper rust) is also alkaline copper carbonate (the main component is Cu2(OH)2CO3, not a pure substance). Beautiful green powdery crystals, decompose when heated to 220℃. Insoluble in water and ethanol, soluble in ammonia water to form divalent copper ammonia complex. It dissolves in acid to form the corresponding copper salt, and dissolves in aqueous solutions of cyanide, ammonia, ammonium salt and alkali metal carbonate to form copper complexes. Brown copper oxide is produced when it is boiled in water or heated in a strong alkaline solution. It can react with hydrogen sulfide to form copper sulfide. It exists in nature in the form of malachite.

If left in the air for a long time, it will absorb moisture and release carbon dioxide, slowly turning into green malachite. In nature, it exists in the form of azurite.

[Medicinal material] It is emerald green powder with loose texture. Odorless, slightly astringent taste. Burning with green flames.

In addition, there is a kind of processed verdigris, which is made by mixing verdigris powder or green blue (natural alkaline copper carbonate) with gypsum and water, flattening it, cutting it into blocks, and spraying it with sorghum wine to make the surface green. The medicinal material is in the shape of a rectangular block, about 5 cm long, 2 cm wide and 5 mm thick. The outside is green, and the inside is khaki or light green. Hard and brittle. Odorless and tasteless.

[Chemical composition] It is alkaline copper carbonate generated by copper oxidation or natural malachite, mainly containing alkaline copper carbonate.

【Nature and flavor】Sour, flat, poisonous. ① "Yao Dui": "cold." ② "Jiayou Materia Medica": "neutral, slightly toxic." ③ "Bencao Jingshu": "sour, bitter, slightly cold."

[return through meridians] enters the liver and gallbladder meridians. ① "Compendium of Materia Medica": "enters the liver and gallbladder." ② "Yuzhu Yaojie": "enters the hand Taiyin lung and foot Jueyin liver meridians." [Functions and indications] Removing cataracts, removing rot, healing sores, killing parasites, and spitting out phlegm. It is used to treat eye cataracts, rotten eyes, carbuncle, hemorrhoids, throat paralysis, tooth scurvy, ecthyma, stubborn tinea, and stroke caused by wind and phlegm. ① "Yao Dui": "It is used to treat wind-induced tearing." ② "Ben Cao Shi Yi": "It improves eyesight and removes redness of the skin; it is used to treat metal sores and stop bleeding."

The above is some common knowledge about verdigris and its medicinal effects. I believe that after knowing and understanding these contents, everyone should have a deeper understanding of verdigris in life. Whether it is used in life or as a medicine, we should pay attention to abide by the principles in order to exert its health value.