Silverware is a variety of ornaments made of silver. Silver is one of the precious metals. Silver and white are made of various kinds of processing techniques. The silver jewelry is processed into a wide variety of earrings, neck ornaments and jewelry. 5 categories of footwear and costumes.
Silverware
A
Silver is one of the precious metals, the symbol is Ag, and the English is silver. Silver is silvery white, with a relative density of 10.49, melting point (961 ° C), insoluble in alkali and most organic acids, soluble in nitric acid and hot sulfuric acid, and combined with sulfur dioxide in air to become brown Ag2S. 925 silver is 92.5% silver added to 7.5% copper and other alloys, which improves the hardness and gloss of silver.
B
The color of silver is expressed in thousands of points. Full silver: silver is not less than 990 ‰, imprinted as full silver or S990, silver 990.
C
The content of silver in the earth's crust is very small, accounting for only 0.07ppm. There is a single natural silver in nature, but it is mainly the state of the compound. The content of elements in the sun: (ppm) 0.001 element content in seawater: (ppm) Pacific surface 0.0000001.
D
Silver ore is mainly silver ore, followed by horn ore and natural silver. It is co-heated by silver ore with salt and water, combined with mercury to form amalgam, and mercury is distilled off to obtain silver. Or it can be obtained by leaching silver ore with cyanide alkali and adding lead or zinc to precipitate silver. 925 silver: silver is not less than 925 ‰, imprinted as S925 or silver 925.
E
925 silver (sterlingsilver) is an international standard for silver jewelry. Because of its increased hardness, it is mainly used to make fashionable silver jewelry with complicated craftsmanship. While silver is relatively soft, it is not suitable for setting precious stones or fine styles. It is generally used to make traditional children. Lock the children's bracelet and the old man's bracelet.
Processing technology
A, silk flower engraving technology
This is an ancient technique that is common in Chinese and foreign gold and silver processing. Make the gold and silver hammer thin, then use the scorpion to pull out the effect of the relief, or smash the rich ornamentation. In general, the larger the area, the more effective the effect is.
B, melting method
This technique is more common in Europe. It is only used for silver production. There are some accessories with a drip-like effect. It is also much better than gold in silver. It has a great charm.
C, Japanese wood grain metal
The main material is also silver, the manufacturing technique is very interesting, and the artistic and decorative effects are very strong. The method is to mix pure silver and different content of copper-silver alloy, nickel-silver alloy, copper, brass, red copper (sometimes with a small amount of gold), etc., and then layer-by-layer welding, and then flattening, and then flattening, metal surface The texture effect of different colors will appear.
D, black silver mosaic technology
This is an alloy decoration technique for silver. This technique is widely used in the Middle East, Russia, and Thailand. Ukrainian jewellery is made of enamel or engraved silver design, and then filled with pure black copper, silver and lead alloy in the pattern, polished to reveal the silver pattern, black and white contrast, showing a dignified twelve points.
Silver by process
It is basically divided into three categories: bright silver, primary color silver (hand silver), and Thai silver. It is divided into mosaics with gemstones and plain silver with no inlays.
A, bright silver
By electroplating tantalum or other electroplating materials on the surface of the silverware, the silver has the same luster as platinum, and the silver is isolated from the air. As long as the coating is not damaged, the silverware can be oxidized for a longer period of time, which is the mainstream silverware process.
B, primary color silver
Silver itself is processed without any processing and is crafted by semi-manual or hand-crafted techniques to give the silver a simple and natural style.
C, Thai silver
The vintage-style silverware, which is artificially vulcanized, makes the silverware oxidized and worn. This style of silver is more individual and highlights the style of silver.
Imitation
A, silver package
Silver is the surface of a metal product that is wrapped with silver by mechanical or other means.
B, silver plated jewelry
The silver-plated jewellery is an alloy of copper-based metal. It is often added with metals such as zinc and nickel. The surface is silver-plated to improve gloss. The advantage of this material is that the corrosion resistance is better than that of copper and the process properties are Approximate K gold.
C, "sandwich" silver jewelry
"Sandwich" silver jewelry is a new imitation of silver jewelry detected by the testing center in July 2002. No relevant reports have been reported before. The imitation surface is silver, and the inside is the sandwich of the harmful element "cadmium". The biggest characteristic of cadmium is that there is a great safety hazard, which will cause permanent damage to the human nervous system.
Why does silver turn black?
1
Because each person's endocrine and physical condition are different, some people's sweat contains more acid, some people are less, and some people have higher sulfur content in body fluids. These are the substances that cause the surface of the silverware to turn black, so everyone Wearing silverware will produce different results, and some people will be as bright as new for half a year.
2
Sulfur, nitric acid and oxides in air and other substances (such as eggs and cosmetics) have a corrosive effect on silver. Silver jewellery is worn for a long time. When sulphur and silver are combined, a black silver sulfide film is formed on the surface of the silver jewellery. It begins to appear as tiny spots, which then diffuse into pieces, forming what is commonly called silver scale. Become black.
7, silverware maintenance methods
Many people like silver, but they don't know how to maintain it. They even think that silver is difficult to maintain. This is not the case. After learning why silverware is getting dark, we only need to spend a little time in our daily life, so that the silverware we wear can last forever.
1
When the silverware is not worn, it should be cleaned and then collected. It is best to use a closed pocket to prevent oxidation and blackening. If the wearer has more sweat, he can wipe the surface with a soft cloth every day. It is best to use a special silver cloth for the silver plating of the surface. (Note: The silver cloth contains maintenance ingredients and cannot be washed.)
2
Silver plating without electroplating, you can do it yourself for daily cleaning, such as squeezing toothpaste, adding some water, washing with a soft cloth, the gap can be brushed with a soft soft toothbrush, and then rinsed with water. (Gemstones with gemstones should not be stained with water to prevent the water from affecting the firmness of the glue. It is best to be cleaned by specialists in the store)
3
The craftsmanship of silverware is varied and the maintenance methods are different. It cannot be generalized. Many maintenance methods on the Internet can only be used as a reference. It is best to ask the store professionals to avoid improper operation and damage the beloved silver ornaments.
4
Silver ornaments with exquisite and three-dimensional sculptures, avoiding the intentional wiping of light. If you find signs of yellowing in the silver, you should first clean the cracks of the silver jewelry with a small brush, then wipe the surface with a silver cloth to restore the original silver and light.
5
If the silverware is not processed and stored after being worn, it is highly likely that the silverware will be blackened. At this time, you should use a small jewelry brush to clean the fine seams of the jewelry, then drop a silver drop of the silver cream on the paper, wipe off the black oxide on the silver surface, and then use the silver cloth to restore the original brightness of the jewelry.
6
If the silver jewelry turns black, don't rush to wash it with silver. Because silver water is a chemical, it also has a certain corrosive effect on the jewelry. Silver cloth is your first choice.
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