All green chains are made of copper. Copper reacts with oxygen, carbon dioxide and water vapor in the air to produce substances, also known as verdigris, which are green. Tonglu-generally refers to basic copper carbonate. Basic copper carbonate is malachite green, so it is also called malachite. Therefore, your necklace contains a large proportion of copper.
Is verdigris harmful to the body and skin?
1, on skin: irritate skin and mucous membrane.
2. Above the eyes: the effect of stimulation
3. Sensitization: There is no known sensitization phenomenon.
Method for removing rust spots of copper rust
1, heating mode
This method is mainly aimed at iron money with shallow corrosion. The main component of rust is ferrous oxide, and its molecular structure is relatively loose, so some iron coins can be rusted by using the principle of thermal expansion and cold contraction. But when using this method, we must pay attention to adding a container (such as a metal container such as a pot), and it is best to add some water. Secondly, the heating time should not be too long. Generally, after heating for three or four minutes, take it out and cover it with a cold wet towel, and the rust will naturally fall off. Choose heating method to remove rust, and the object should be iron coins with good ferrousness and shallow corrosion. Never use heating method to remove rust from copper coins with serious corrosion and very fragile copper body, otherwise the already fragile copper body will not stand the high temperature and break into pieces.
2, dry brush method
When copper rust or rust adhesion is shallow, chemical means such as vinegar bubble should be avoided as far as possible, and dry brush can be used instead. The specific method is to choose a large oil painting pen and cut the brown hair on the pen tip to 0.5-0.7 cm from the root to use. First put the rusty copper to be brushed on the glass plate, fix it, hold the root of the oil painting pen and brush it evenly, pay attention to the force, otherwise the effect will be poor, and then wash it with clear water.
3, vinegar bubble method
Wash the rusty bronzes, put them in a small dish, and pour a little vinegar until they are immersed. Take it out after 24 hours, brush off the residual rust with a small brush, then wash the vinegar with clear water, wipe it clean and dry it in the shade.
4, boiling water immersion method
Rusty copper is sometimes covered with an indelible layer of soil rust. At this time, you can put the rusty copper into the bowl first, and then pour boiling water at 80℃ to 90℃ until it is submerged. Take it out after 5 minutes, brush it with a small brush and dry it in the shade. If the soil is seriously corroded, water can be heated to boiling to make the soil rust and fall off.