How to remove the rust on ancient coins?

Toothpaste water can be used to remove copper rust. The following are the specific steps:

Tools needed: toothpaste, water cup.

1. As shown by the red circle, this copper coin has a lot of rust.

2. Then find a water cup and squeeze toothpaste into it.

3. Stir the toothpaste evenly with a wooden stick.

4. Put the rusty copper coins into toothpaste water.

5. Wait an hour.

6. After an hour, fish it out.

7. It can be seen that the rust removal is clean and the effect is good.

Precautions:

Copper rust is generally divided into harmless rust and harmful rust. Due to the erosion of water, soil and atmosphere, the surface of bronzes has gradually changed, and they have formed a protective layer on the surface of bronzes to prevent them from being corroded again, adding a quaint color to bronzes. This is commonly known as "harmless rust". Harmful bronze rust is as harmful as green powder, commonly known as "bronze disease", that is, harmful rust.

Molecular weight of CuCO3. Cu(OH)2 is 22 1. 12. Beautiful green powder crystal. The relative density is 3.8525, the refractive index is 1.655, 1.875, 1.909, and it is decomposed when heated to 220℃. Insoluble in water and ethanol, soluble in ammonia water to form an ammonia complex of divalent copper. Soluble in acid to form corresponding copper salt, soluble in aqueous solution of cyanide, ammonia, ammonium salt and alkali metal carbonate to form copper complex.