-
Anonymous users2024-02-06It is best to use a slow-reacting solution, such as a 5% dilute sulfuric acid solution, which gradually washes away the surface of the ancient coins damaged by rust and leaves the intact parts undamaged. The length of time a copper coin is immersed in solution depends primarily on the surface state of the coin: i.e., the degree of oxidation.
The darker and thicker the oxide layer, the longer the soaking time should be. Heavily oxidized copper coins can be soaked in solution for several days and nights, while slightly oxidized ancient coins can be soaked for only a few hours. During the soaking process, the dissolved oxides can also be washed with a soft cloth in a stream of warm water so that the solution can better act on the newly exposed rust layer.
When washing, you should remember: wear rubber gloves and wash the ancient money in the solution with tweezers. After cleaning, the quality of ancient coins can be improved, but you should be mentally prepared for the corrosion pits and scratches exposed after cleaning.
And with the passage of time, the ancient money will still blacken and reappear oxide, so it is especially important to pay attention to preservation.
Coin preservation: These types of coin must be packaged in a single piece. For gold, silver and copper and other coins, the texture of these types of ancient coins is relatively soft, rubbing against each other will inevitably cause certain damage, and as far as gold, silver and copper and other currencies are concerned, the most susceptible to scratches and scratches is the relief part, so in order to avoid similar situations, it is best to choose the packaging of the model that matches the size of the ancient money, and for some relatively thin and crisp ancient coins, cotton wool, paper and other things can also be placed as padding.
Of course, in order to strengthen the protection measures, special means such as vacuum packaging and nitrogen gas can be used to slow down the oxidation rate of ancient coins.
-
Anonymous users2024-02-05Try to wash with water and toothbrush, and do not wash with acidic liquid if you are inexperienced, which is easy to corrode the coin sheet.
-
Anonymous users2024-02-04It's best not to wash it, the pulp is washed away, and it won't look good.
-
Anonymous users2024-02-031. If the copper coin is rusty, the rust can be removed through the following six steps.
2. Tools required: a number of rusty copper coins, a bottle of white vinegar, a stiff-bristled brush, a soft-bristled toothbrush, and a small pot.
3. Pour the white vinegar into a small pot.
4. Put the rusty copper coin into a small pot and wait for 5 minutes. The purpose of this step is to soften the rust and make it easy to remove.
After a few minutes, use a stiff bristle brush to brush first, the purpose of this step is to use a stiff bristle brush to remove most of the rust on the surface that is not easy to remove.
6. Then use a soft-bristled toothbrush to write the book, the purpose of this step is to prevent scratching the copper coins and remove the remaining rust.
7. Put the copper coin with the rust removed into the small pot for one minute, the purpose of this step is to make the copper coin shiny.
8. Finally, take out the copper coin and wipe it dry. After the above treatment, the copper coin has a new look.
At present, the pickling and grinding methods that are rumored on the Internet are serious damage to the coin base plate and pulp, and it is firmly opposed by experienced spring friends! Why can't ancient coins be cleaned with acid (including vinegar, oxalic acid, toilet cleaner, etc.)? First of all, the acid not only erodes the toning and the baseplate, but the bronze coin washes the toning and thus loses its value. >>>More
Can't wash off the black dirt of slippers? Teach you a cleaning method, wash it like new! In summer, many casual boys generally like to go out in slippers. >>>More
You can use sea salt water to clean the nasal cavity every day, gently drip the salt water into the nasal cavity, and gently wipe off the dirt when the liquid flows out.
I believe many people know that it is best to wash grapes when eating, otherwise they will easily spoil after washing first. But in life, after the grapes are ripe, and then it is a long "trek" to get home, the surface of the grapes often does not look as clean as it looks, so how to clean the grapes if you want to eat them? Let me introduce it to you. >>>More
Clean the octopus, first add an appropriate amount of vinegar and alkali to the water, then add the octopus, rub it with your hands until the mucus on the surface of the octopus is cleaned, find out the teeth of the octopus, and then lift the head of the octopus, squeeze out all the internal organs of the octopus, and clean the ink. 1.Add an appropriate amount of vinegar and alkali to the water, then add the octopus and rub it with your hands until the mucus on the surface of the octopus is cleaned and find out the octopus's. >>>More