How to distinguish silver from copper and iron?

Methods of distinguishing silver, copper and iron;

1, observe the color.

If it is a simple substance, silver is white, copper is purple or yellow, and the rest is iron.

Step 2 consider

Silver is denser than copper and iron, and the same volume of silver is heavier than copper and iron.

Step 3: Absorb with a magnet

Magnets can adsorb iron, iron can adsorb, and copper and silver cannot.

How to distinguish the purity of silver jewelry

(1) Check the hardness?

The higher the fineness of silver jewelry, the softer the texture and the whiter and smoother the surface. Take a silver bracelet of about 60 grams as an example. If you pull it by hand, it will open and have no elasticity, and the color is about 95%. If it is a little elastic, the color is about 80% ~ 90%; If the elasticity is large, the fineness is below 70%. ?

(2) Look at stubble?

Cut or fold silver ornaments to see the color of stubble. If the jewelry is soft, the stubble is thick and soft, slightly red, and the color is about 95%. If you bend hard by hand, the stubble is white gray or reddish, and the color is about 90%; If the hardness is large, the stubble is reddish, yellowish white or light gray, and the color is about 80%.

If it is a hard bend, the stubble is reddish, yellowish, khaki and other colors, and the color is about 70%; If the stubble is red, medium and black or yellow, the color is below 60%. ?

(3) Silver drug smear test?

Grind the silver ornaments on the touchstone (the same as gold inspection) and coat them with silver medicine (silver medicine is a soft mixture of silver powder and mercury), so that the color of silver medicine will be high if it is hung more, but it will be low if it is hung less, and those without silver medicine will be fakes. ?

(4) color discrimination?

Distinguish its color and authenticity with vision. High color, white, delicate, shiny, jewelry printed with manufacturers, store numbers and other signs; Low color, yellow color and rough workmanship; The fake silver jewelry is dark and not bright. ?

(5) Bending method?

Pinch with fingers, soft and elastic, high color, easy to bend, not easy to break; The quality of the bend is hard, or barely moving, and some can't even move their fingers; The bending of silver plating or a few strokes with a hammer will crack; Fake ones can't stand bending and break easily. ?

(6) Throwing method?

High-quality silver jewelry is relatively heavy, so it doesn't jump high when thrown on the table, and it has the sound of "poop"; Fake or poor quality is relatively light, and it bounces high when thrown on the table, making a crisp sound. ?

(7) nitric acid identification method?

Drop nitric acid on the file mouth of silver jewelry with a glass rod, and the dark color is brown rice, dark green or light green; Light colors are dark green or even black. ?

In addition, when buying silver jewelry, we should also choose the quality from the following four aspects:?

(1) Look at welding. Some silver ornaments are welded, so it depends on whether the welding is clean and tidy, whether there is false welding or open welding. ?

(2) Look at the brightness. It requires pure electroplating color and strong brightness. ?

(3) Look at the veneer. Firm and upright. ?

(4) look at the claws. It depends on whether the claws have burrs, prick hands and scratch clothes. It is convenient to wear.

Extended data:

The material of many silver ornaments is often silver-copper alloy, and this kind of silver ornaments should pay more attention to anticorrosion. In order to prevent silver jewelry from blackening, there are three common methods:

(1) surface treatment: this is an industrial method, which is not easy for individuals to adopt.

(2) Surface coating treatment: coat a transparent clear paint film on the jewelry surface to isolate silver from the outside air. Ordinary wearers can apply colorless and transparent nail polish to jewelry. This method is particularly simple and does not affect the luster of silver jewelry.

(3) Always keep the silver jewelry clean and dry, try not to let the silver jewelry come into contact with sulfur-containing chemical gases, and do not use sulfur soap to clean the silver jewelry. Silver jewelry should be stored in a sealed and dry place when not in use.

The correct way to dress.

1. It is best not to wear it when taking a shower or sleeping.

2. Avoid contact with flowing air when not wearing, and put it in a jewelry box or sealed bag.

Don't swim with you, especially in the sea.

People who sweat a lot are not suitable for wearing silver ornaments.

Treatment of silver ornaments after oxidation;

1. Wipe the surface with a silver cloth. If the oxidation is serious, it can only be wiped off by force. Then use detergent to clean the black oxide on the surface and dry it with a paper towel.

2. Silver washing water: Because silver washing water will corrode the surface of silver ornaments, it can only be used in the case of serious oxidation of silver ornaments and cannot be used repeatedly. Immerse the silver ornaments in silver washing water for 5 seconds, and then wash the surface with detergent. Don't let the silver washing water remain on the surface, dry it with a paper towel.

Reference: Baidu Encyclopedia-Silver Jewelry