1, natural oxidation, not often worn, no matter after taking off, casually put, silver will combine with sulfur dioxide in the air to have a natural oxidation reaction;
2. Sweat secreted by people with acidic constitution makes silver ornaments easy to turn black and yellow;
3. Contact cosmetics, because cosmetics contain lead, mercury and sulfur. If the content exceeds the standard, silver ornaments will generate black silver sulfide;
4, eggs will produce hydrogen sulfide, contact with eggs will also make silver jewelry black and yellow.
Solution:
(1) Wipe with cotton dipped in white vinegar, black silver sulfide will dissolve in ester acid, and silver jewelry will glow again.
(2) Wipe with alcohol or sodium carbonate, and the effect is also very good.
(3) Wash the surface of ornaments with detergent, then with sodium thiosulfate solution (prepared by adding 20g sodium thiosulfate into 100g water), and then with clean water.
Question 2: What is the reason why silver ornaments turn yellow? This is due to the chemical properties of silver. The chemical properties of silver are not as stable as gold or platinum, and its surface has not been specially treated. Pure silver with a color above 92.5% is easy to lose its original luster due to oxidation or strong light irradiation. Even after special treatment, if you don't wear it often, the surface color may turn yellow after a period of time. Silver ornaments turn black because silver reacts with sulfur in the air to produce black silver sulfide. Therefore, silver jewelry should not be in contact with perfume, powder, balsam, sulfur soap, sweat and acid. Treatment: 1. Wipe with cotton dipped in white vinegar, black silver sulfide will dissolve in ester acid, and silver jewelry will glow again. 2. Wipe with alcohol or sodium carbonate, and the effect is equally good. Use detergent first, then sodium thiosulfate solution (prepared by adding 20g sodium thiosulfate into 100g water), and then clean the surface of the ornament with clean water. Using 1 part tartaric acid, 1 part alum and1part salt, heating the mixture to boiling, and soaking the jewelry; /kloc-take it out after 0/0 minutes, wash it with clear water and dry it. 3. Wash it with ammonia water and wipe it on the flannel with toothpaste, which can also restore the original luster. Note: 1. Avoid putting it with hair gel, perfume and skin care products. 2. Take off the silver ornaments when washing, bathing and doing rough work. 3. Always use silver cloth to keep them fresh and make jewelry shine forever. The best way to maintain silver jewelry is to wear it every day, because human body oil can make silver jewelry produce natural and moist luster. 5. Silver ornaments contact hot spring water or sulfide, which is easy to change the surface and should be avoided in hot spring areas. 6. Silver is light brown when it is oxidized. You can put a little silver oil on the soft cloth, soak it in silver washing water, or wipe it directly with silver cloth (silver cloth contains silver maintenance ingredients and cannot be washed with water, and the stains produced by wiping are silver and can be used many times). 7. Silver ornaments should be sealed when not in use.
Question 3: What is the reason why silver ornaments turn yellow? Generally speaking, silver jewelry will turn yellow and black. Without silver jewelry, it can be said that it will never turn yellow and black.
In fact, the reason why silver ornaments turn black is not the oxidation of silver, but the vulcanization, and the reaction between sulfur and silver produces compounds of sulfur and silver.
So wear silver ornaments, avoid hot springs and avoid contact with seawater;
In addition, all kinds of shampoos and shower gels may also make silver jewelry black when taking a bath.
Question 4: Is there anything wrong with the silver jewelry turning yellow? 1. The reason why silver ornaments turn yellow.
1. Silver is an active metal. If it is not worn for a long time, it will turn yellow when exposed to air, and (Ag) will be oxidized.
:4Ag+O2=2Ag2O)
2. Silver and gold can't be worn together, which will cause silver to turn yellow. Of course, even if you don't wear it at the same time, the silver jewelry will change color after a long time, whether it is electroplated or not!
Second, the treatment method of silver jewelry yellowing
When the silver ornaments become slightly Huang Shi, please clean the fine seams of the silver ornaments with a small jewelry brush, and then gently wipe them with a silver cloth to restore the original silver state. After wiping, I suggest that you must put the silver ornaments in a sealed bag and take good care of them. Special attention: If the silver cloth is used to restore about 80% of the silver state, the silver ornaments will turn yellow seriously, so the soaking time with silver washing water should not be too long, usually a few seconds. After taking it out, wash it with clear water immediately, and then blot it with paper towels.
Question 5: What is the reason for the blackening of silver ornaments? I think (I have been engaged in the processing and production of silver jewelry for many years 10),
The higher the purity of silver jewelry, the better its flexibility and easy to be oxidized. The oxidation process turns yellow first, and then gradually turns black. It's not what he said. The purity is not high. At present, 92.5% of the internationally accepted silver content is pure silver. Now there are 925 and 990 silver ornaments on the market, both of which are pure silver. Only the purity of the latter is higher!
The reason why your silver jewelry turns black may be:
1, as a testing tool, has been widely used in ancient times. Seeing a lot of ancient costume films, the emperor would insert a silver hairpin in the dish before eating every time, and in ancient times, he would also use a silver needle to test drugs when solving crimes. These are all verified. Then because the human body is constantly metabolizing and eliminating toxins, if the toxins in the body are eliminated and silver is encountered, then silver will turn black. This also reflects that you may not be in good health recently, so you should pay attention to your own examination.
2. Usually there are more housework, and I often contact some strong acids and alkalis. Then, these things are easily oxidized with silver jewelry and their colors change. Pay special attention to, can't contact with gas, preserved eggs, a contact will change color.
Solution:
1, clean with toothpaste and toothbrush.
2. Wipe the surface with pure cotton cloth. (e.g. jeans)
3. Go to the jewelry store and clean it directly.
If you have any questions, please feel free to communicate!
Question 6: What is the reason why silver ornaments turn black and yellow? . Follow-up: I know he is a copy. I've seen it. In the last two months, mine began to change color. They said I was poisonous. Answer: No poison. What's wrong with you recently? Your friend has watched too many martial arts movies. Q: No answer: Did you sleep well? Follow-up: Good answer: Have you ever served wind and fire? Follow-up: What do you mean by taking the wind to make fire? Answer: Well, I don't know, but my grandmother brings me wind and fire every year, which is good for my health. I can only teach you the method. I went downstairs and asked my grandmother. She said that the circle turned black because you had "fire", such as gauze, shiny silver ornaments and green leaves. For example, do you know what it is, and what is the first rattan hanging in front of the Dragon Boat Festival? Anyway, it's that kind, and then boil medicine soup and boil eggs, right? Then boil an egg in it, take the boiled soup to the bathroom, take out the boiled egg first, roll it on yourself (take off your clothes, just like taking a bath), put the egg in the soup when it is cold, heat it, repeat it many times, and then break it, only to break the skin, and then open it for a while to see if the egg is yellow and fluffy (if it gets up, it will continue if it doesn't get up) and then put it in the medicinal soup. If it is cold, I suggest you soak it in the medicine soup for a long time, and finally see if your silver jewelry changes color for half an hour to an hour. If it does, you're out. Q: What's the trouble? Answer: I'm afraid it works. Anyway, I have been typing for a long time, and others still find it troublesome. Don't ignore me. Q: The conditions here are not allowed. Answer: What is missing? Do you have any eggs? Aluminum pot? Do you have any silver ornaments? The herbal medicine store I mentioned may not sell green leaf medicine. This is a dry medicine. It used to be green, not fresh medicine. They are sold in pharmacies. What do you need? Follow-up: silver ornaments have no pot black. Answer: I didn't say I had to have your silver jewelry. Can I borrow a pot?
Question 7: What is the reason why silver turns yellow? Silver is an active metal, which easily reacts with sulfur in the air and discolors silver ornaments. In addition to the unexpected reaction with the outside world, if the human body sweats, it will also make the silver ornaments black, and the chloride in the sweat will also affect the silver.
The fundamental reason why the silver bracelet turns yellow is the chemical reaction of sulfur in the air. There is no way to stop it from changing in the world at present. Plating platinum (palladium and rhodium) on 925 silver can effectively isolate 925 silver from the outside air. This platinum effect can generally last for 4- 12 months according to the degree of protection of jewelry, and then it will become the effect of silver itself.
Question 8: What caused the silver bracelet to turn yellow?
1, natural oxidation, not often worn, no matter after taking off, casually put, silver will combine with sulfur dioxide in the air to have a natural oxidation reaction;
2. Sweat secreted by people with acidic constitution makes silver ornaments easy to turn black and yellow;
3. Contact cosmetics, because cosmetics contain lead, mercury and sulfur. If the content exceeds the standard, silver ornaments will generate black silver sulfide;
4, eggs will produce hydrogen sulfide, contact with eggs will also make silver jewelry black and yellow.
Solution:
(1) Wipe with cotton dipped in white vinegar, black silver sulfide will dissolve in ester acid, and silver jewelry will glow again.
(2) Wipe with alcohol or sodium carbonate, and the effect is also very good.
(3) Wash the surface of ornaments with detergent, then with sodium thiosulfate solution (prepared by adding 20g sodium thiosulfate into 100g water), and then with clean water.
Question 9: Why do silver ornaments turn black or yellow? The blackening of silver ornaments has nothing to do with physical acid, because in summer, the human body is prone to sweating, and the sweat is acidic and corrosive to silver ornaments. Moreover, you may wear silver jewelry to take a bath. Both bath lotion and soap are acidic, which will also make silver jewelry easy to turn black. Don't worry, the blackened silver ornaments can be brushed with toothpaste to restore their original appearance.
1. Don't wear other precious metal jewelry when wearing silver jewelry to avoid collision, deformation or wear.
2. Avoid contacting silver ornaments with water vapor and chemicals, and avoid swimming with them, especially when going into the sea.
3. Wipe the silver jewelry with cotton cloth after wearing it every day, and put it in a jewelry box or bag for sealed preservation. If it is really impossible to clean, scrub it with silver washing water: after washing, the silver ornaments should be dried with cotton cloth.
If the silver ornaments show signs of yellowing, the easiest way is to gently wash the surface with toothpaste and some water. Or use a small jewelry brush to clean up the fine seams of the silver ornaments, and then gently wipe the surface with a silver cloth, and the original aesthetic feeling of the ornaments can be restored immediately. (If the silver cloth can restore about 80% to 90% of silver, don't use silver lotion and silver washing water, because they are corrosive to some extent, and silver ornaments are more likely to turn yellow after using these products. In addition, silver cloth contains silver maintenance ingredients and cannot be washed with water)
5. The silverware is seriously yellowed, so it should not be soaked in silver washing water for too long, usually in a few seconds. Rinse with clear water immediately after taking it out, and then dry it with a paper towel.
6. If the silver cloth can recover about 80% silver, there is no need to use silver lotion and silver washing water, because these products are corrosive to some extent, and the silver ornaments will turn yellow more easily after using these products. Silver wipes contain silver maintenance ingredients and cannot be washed.
7. If the silver jewelry is not treated and collected after wearing, it is very likely that the silver jewelry will turn black. At this time, you should use a small jewelry brush to clean the fine seams of jewelry, then drop a drop of silver emulsion on the paper towel to wipe off the black oxide on the surface of jewelry, and then use a silver cloth to restore the original brightness of jewelry. After that, you should remember to do the daily general maintenance to prevent the silver ornaments from turning black again. Silver ornaments are difficult to rub white after many blackening.