Does pure gold turn black? Does gold turn black

Pure** will not turn black, it will only get dirty. **The chemical properties are stable and will not react with oxygen, acids, etc., so in daily life, there is no need to worry too much about the color of **jewelry. If there is black ash, ink or the like, you can put it on the fire and burn it, real gold is not afraid of fire, that's how it came about.

Physical Properties:

1. Color: The steam emitted when the gold is melted is green; During the smelting process, its gold dust is usually brown; If you cast it into a thin sheet, it can even transmit green light.

2. Ductility:

Exceptionally strong. Its malleability makes it easy to cast, making it an excellent choice for jewelry. Gold is the most tensile of all metals.

3. Malleability:

Leading. It can create extremely thin gold flakes that are easy to roll up. **The color is golden yellow, metallic luster, and difficult to decompose. Hardness 2-3, pure gold, melting point; It has good ductility, can be pressed into thin foils, and has extremely high heat transfer and electrical conductivity.

The resistance of pure gold is. Pure gold has good chemical resistance and is the best electroplating material.

**As a kind of ***, it has good physical properties, "real gold is not afraid of fire" is that gold has high chemical stability and is not easy to react with other substances.

Don't worry about oxidation and discoloration. High density and heavy feel. Good toughness and ductility, good conductivity.

Pure gold has a brilliant yellow color, but the color changes greatly when mixed with other metals, such as dark red for gold-copper alloys and light yellow or off-white for silver-containing alloys. Gold is easily ground into powder, which is why gold is dispersed in nature, and pure gold jewelry is also easy to be worn down to reduce the weight.

**Although it is a very soft metal, it is not as good as lead and tin. Fingernails can be scratched on pure gold, and this softness makes it very easy to process, but this is not ideal for the maker of ornaments, because it is easy to rub the ornaments, make them tarnished and even affect the appearance. Therefore, when making jewelry with **, copper and silver are generally added to improve its hardness.

If it is pure, it will not fade, if it will fade, it will definitely not be pure gold, pure ** will only be dirty, because the surface time will be oxidized with the oxygen in the air.

If it is dirty, it will look old, but if it is dirty, you can wash it, use a toothbrush to get some dish soap.

Or the toothpaste can be washed off, and it will also be wiped off with a cloth.

Pure** is not going to turn black

Under normal circumstances, gold is easy to turn black, if you wear it for a longer time, the harmful substances such as lactic acid and urea secreted by the human body will react with gold, and you may also encounter relatively dry weather, so that the surface gloss of ** becomes dull, so you should pay attention to maintenance at ordinary times.

Silver will turn black, I don't think it will be pure gold.

It is recommended that ** do not wear it at the same time as platinum, it will change color.

Are you stupid enough to say you have a **?

Gold will turn black.

Generally, jewelry will be oxidized and lose its luster when worn for a long time, ** jewelry blackening is often due to dust in the air and oil secreted by the human body and local blackening; In addition, ** jewelry and silver, copper chemical reaction, the formation of black silver oxide and copper oxide, this phenomenon does not belong to the quality of ** jewelry.

Gold fades, in many cases, due to chemical reactions caused by contact with external substances, which makes the surface of the surface metallic and dull or even fades. This is the case even with what we usually call thousand-foot gold jewelry.

Precautions.

If you have changed color and cannot clean it yourself, send it to a ** jewelry store and a professional will help you clean and maintain it. Avoid wearing jewelry, especially rings, when doing heavy work. When swimming, remove the ** jewelry to avoid chemical changes on the surface after touching seawater or pool water.

**Jewelry must be kept away from chemicals. After wearing, the ** jewelry often loses its luster due to stains and dust infection, at this time, as long as the ** jewelry is soaked in warm water with neutral detergent and cleaned, and then taken out to wipe dry.

Do not make pure gold jewelry touch perfume, hairspray and other highly volatile substances, otherwise it is easy to cause the ** jewelry to fade. **Rings and platinum rings are worn in the same hand, which is easy to cause the two to rub against each other, so that the appearance of the **ring is partially rubbed with platinum and white. Regarding the ** jewelry that turns white in this way, it can be planed with an agate knife, and it can also be rubbed vigorously with a coarse cloth (such as canvas) to restore the brightness.

**There are three main factors for jewelry blackening:

First: the time factor.

Over time, ** jewelry will lose its luster due to its environmental factors. For example, in some arid areas, there are often fine dust in the air, and if it is contaminated with the human body, it will form a kind of "human sandpaper", which can wear away the ** jewelry into very fine debris under the action of time, and local black stains appear.

Second: the everyday cosmetic factor.

Cosmetics contain certain chemicals, which also contain some fine hard particles. If it is accidentally applied to the **jewelry wearing part**, it will provide an opportunity for cosmetics containing chemicals and **jewelry that is most afraid of chemical erosion to "get together", and the result is naturally not good.

Third: Excretions from the human body.

The human body will have waste products excreted from the body every day, including chlorinated substances, lactic acid, urea ammonia, etc., when they come into contact with **jewelry, there will be some chemical reactions, for example, when the silver and copper in **jewelry will produce a chemical reaction under the action of some sweat, showing dark black silver chloride and copper sulfide, this chemical salt sometimes falls from **jewelry, and will also pollute the wearer**, leaving a very obvious black stain.

The main reason for the blackening of jewelry is the above three factors, if you want to keep your own jewelry bright in life, you must know how to maintain your own jewelry, such as before doing cleaning work, take off the jewelry, do not pull the necklace and other jewelry, try to avoid contact between jewelry and perfume, hairspray, etc.!

It turns black on contact with foreign objects. 1. Corrosion, after being eroded by foreign objects, the surface will gradually turn black, so that the surface will lose its original luster;

2. Stains, the surface of the stain is stained more, and it will slowly turn black, which will seriously affect the texture;

3. Mercury, ** If it comes into contact with mercury or other substances containing mercury, there will be a large area of white spots.

Pure gold does not turn black, blackened mostly alloys, alloys in addition to gold and other metals, these metals will have a chemical reaction with other substances, so as to make **black, when this happens, it is recommended to send it to the store where it was purchased for cleaning.

When the jewelry becomes black, you can send it to the place of purchase, let the professional personnel clean, you can also clean, clean the use of a brush dipped in a special cleaning agent, gently rubbing, for the sake of insurance, it is recommended to let professionals deal with it.

1. How to maintain the black gold bracelet.

1.Use a small toothbrush to dip some toothpaste, scrub the ** jewelry, and then rinse with water, which can restore the luster and shine as new; You must think that if there is a dead end, use a small toothpick to pick it, otherwise the more you wear it, the dirtier it will become, especially the ** bracelet, which is often carried out with housework, and it is easy to stick to dirty things.

2.The second method is also very simple, you can use a small cotton swab to dip some toilet water, wipe ** jewelry, some black stains are difficult to remove, you can also soak salt and vinegar together, throw the bracelet into it to soak it, take it out and wash it and wipe it dry.

3.**The black silver film on the surface of the bracelet needs to be prepared with 2g of salt + 7g of bleaching powder + 8g of baking soda + 60 ml of water to make a mixed solution, and the **bracelet and the mixed solution are added to the container and let stand for 2 hours, and then the black silver film can be eliminated as long as it is taken out and rinsed with water and then wiped clean.

4.Finally, if you are afraid of damaging the texture of the bracelet by cleaning it like this, then there is another way to remove the stains on the bracelet in the fastest and most effective way. Jewelry stores often use a jewelry detergent to clean a customer's bracelet and restore it to new condition in a matter of seconds, without damaging the bracelet itself.

We collectively call it gold washing. Jewelry and watches can be washed.