Silverware knowledge

First, the characteristics of silver:

1. Silver has a low melting point and is easy to smelt. It can be preserved. Because silver has good ductility, it is easier to shape.

2, silver does not respond to most acids, it is easy to make a variety of jewelry, the surface of the treated silver is smooth and elegant.

3, silver will appear black for a long time, mainly due to the oxidation of the sulfides in the air.

Second, silver jewelry identification:

1, color method: use the eye to observe, looks white, shiny, fine work.

2, bending method: bending silver jewelry by hand, easy to bend and easy to break the color is higher.

3, the throwing method: the silver jewelry is thrown from the top down on the platen, the bounce is not high, and there is a "squeaky" sound of real silver or high-quality silver jewelry.

In addition, on silver, the color is darker than platinum; the hardness is soft, not easy to rust, and has weight.

Third, the difference between gold-plated silver and sterling silver:

1, classification:

Gold plating (silver) is divided into two categories according to the material. One is gold plating (silver) of homogenous material, which refers to the surface treatment of gold (silver); the other is gold plating (silver) of heterogeneous material, that is, Non-gold (silver) surfaces are gold plated (silver) treated.

2, standard:

The international standard for gold-plated jewellery is: a good gold plating layer thickness of 10 microns to 25 microns, typically 2 microns to 3 microns, such as 0.18 microns is inferior.

3, identification:

(1) Look at the color: gold-plated (silver) jewelry generally has better gloss, higher brightness, and lighter color than real gold and real silver.

(2) Test weight: Gold-plated (silver) is obviously lighter in weight than real gold and real silver jewelry.

(3) Listening to the sound: throw the gold-plated (silver) jewelry on the table or the ground, and the sound that is emitted is boring. The sound of real gold and real silver is very crisp.

(4) The weight of real gold and real silver jewelry is much heavier than gold plating (silver), but its hardness is soft, the real gold is more and more bright, and the gold plating (silver) is the opposite.

(5) In addition, the copper-plated white gold jewelry and the white gold jewelry are very similar, and the gloss is higher than that of platinum, the surface is smooth, and the color is never changed.

Fourth, note:

Silver easily absorbs mercury. After absorbing mercury, the surface quality is severely damaged, completely tarnishing, and silver amalgam (also known as mercury silver) is formed. In humid air, silver is easily corroded by sulfur vapour and hydrogen sulfide, which darkens the surface (this is one of the basic conditions for the formation of Thai silver). To this end, we must pay attention to the following matters in our daily life:

1. Cosmetics contain not only mercury but also sulfur, which causes silver to form black silver sulfide. In addition, if the air contains sulfur, it is also not suitable to wear silver. Those who live in chemical plants or work in chemical plants should pay attention, and even more can not wear silver!

2, ozone can also cause silver to turn black. For example, negative ion generators and disinfection cabinets used in daily life should not be placed with silver jewelry.

3, some eggs and poultry will produce hydrogen sulfide gas after the deterioration, if the staff working with the egg and poultry is not suitable for wearing during working hours.

4, the purification of tap water often contains bleaching powder or chlorine gas, which has a serious erosion effect on silver. The eroded silver loses its luster and produces white silver chloride. Therefore, it is not advisable to wear silver to bathe.

5, the washing powder contains bleach, the main component of the bleach is chlorine, which has a certain corrosive effect on silver.

6, mercury (mercury) and silver will work, serious damage will occur, and even the formation of mercury paste, so use the body temperature should be careful.

7, silver is dissolved in hydrochloric acid, nitric acid, if you are engaged in this work, you should pay attention.

Fifth, the maintenance of silver jewelry:

1. Do not wear other metal jewelry at the same time when wearing silver jewelry to avoid deformation.

2, to avoid friction, so as not to fall off the surface layer;

3, should not be in direct contact with human sweat glands for a long time, not suitable for wearing in summer;

4, away from cosmetics, avoid contact with cosmetics.

5, avoid contact with water vapor and chemicals, can not wear it to swim, especially in the sea.

6, if your time is sufficient, wipe it with cotton after wearing it every day, put it in a jewelry box and save it.

7, copper gold (silver) hardness is higher, and alloy gold (silver) hardness is small, wear should pay attention to avoid hard pull hard.

8. Silver will turn black due to oxidation. It can be cleaned with silver cloth or silver water. It can also be brushed with a soft brush and toothpaste. After washing, dry it with cotton.

clean:

1, soaked in Coca-Cola, soaking time is 12 hours.

2, scrub with acetic acid.

3, soaked in tea every night.

4. Wipe with a silver cloth.

5. Use silver-washed water for one to two minutes.

6. Apply the correction fluid to the silver jewelry, and wipe the silver with a cloth before the correction fluid is dry.

7, scrub with toothpaste and toothbrush.

8, burn a black silver jewelry with a lighter (Note: this method is limited to plain silver) gold and inlaid silver jewelry can not be used. The temperature should not be too high. It is forbidden to use matches, because the sulphur in the matches will make the silverware become silver sulfide. Then the silverware will be polished with a silver cloth. This method makes the silver jewelry especially bright.

9, silver jewelry of silver is often black, although it can be cleaned often, but it is very troublesome. It is recommended to prepare a bottle of clear nail polish before cleaning the silverware. After cleaning, use a hairdryer to dry the silver jewelry, and then apply a layer of nail polish to the clean silverware. This method can keep the silverware from blacking for a long time.

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