Because of its high investment preservation and representing a noble symbol, gold jewelry has always been very popular with everyone, and competition is becoming more and more intense.Gold jewelry brand is full of dazzling, now ... now ...
How to identify the authenticity of gold
Because of its high investment preservation and representing a noble symbol, gold jewelry has always been very popular with everyone, and competition is becoming more and more intense.The gold jewelry brand is full of dazzling brand. Now technology is developed, and the gold adulteration incidents are constantly spreading. We do not know how to distinguish the authenticity of gold. Today, I will introduce you how to identify the authenticity of gold and false. Let ’s take a look at China.
1. Look at the color
According to the different gloss and color of gold, you can generally distinguish pure gold, K gold, real gold, and fake gold.That is, gold is better yellow yellow, and the color is more than 95%; the positive yellow color is about 80%; the blue and yellow color is about 70%; the yellow color is slightly gray and the color is about 50%.Therefore, there is a formula for "seven greens, eight yellow, nine five red, yellow leucorrhea ash pairs of half gold."For jewelry that is first from Jiuzang, there will be a saying that "copper turns green, silver turns black, and gold will never change color".
2. Look at density
The density of gold is 19.32 grams/cubic centimeter, which is about double the same volume of silver, lead, and tin.Available formula: The mass (gram) of a certain gold jewelry (gram) is equal to density than the volume (cubic centimeter) of a certain gold jewelry (cubic centimeter).Seeking the density of the gold jewelry tested, the density is about 19.32 grams/cubic centimeter, it is pure gold or more pure gold, otherwise it is a non -pure gold or color difference gold (this method has no destructiveness to the jewelry).
Third, folding hardness
Gold has the characteristics of ductility and small hardness, and can be pressed into thin pieces of 12.7 microns.When the color is high, marks can be left with large head needles or nails.More than 97%of the gold jewelry, after two or three times, wrinkles appear, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious;Jewelry is very hard when bending, without fish scales; gold jewelry containing more impurities, and disconnection two or three times to break; if it is made for raw gold, the curved is broken.When using this method, the width and thickness of the jewelry should be considered. The thick and width should be hardened, and the thin and narrow ones are softer.
Fourth, listen to the rhyme, see elasticity
When the high -quality gold jewelry is knocked out or threw it hard, the dull and low sound of "daedy, daed", and no rhyme, no elasticity, K gold has sound rhyme, sound, elasticity, the more elasticity, the sound rhyme, the rhyme rhyme,The more pointed, the worse, the worse.
Fifth, use the test gold stone to identify the color
Using the gold -pairing card (determined gold medal) and the first jewelery of the subjects on the test gold stone, through the contrast color, the gold jewelry is determined.This method should be carried out under natural light and sunlight, and cannot be carried out under direct sunlight and incandescent lamps.
Six, use acid point
The golden trails of the identified jewelry and cards were grinded on the testing stone. Try nitric acid on the golden road with a glass stick. Because the chemical properties of the golden element are stable and do not respond to the acid, the color remains unchanged.If it is not gold or non -pure gold, the Golden Road disappears or changes.The law of change is "three fast, three slows", that is, the low -quality disappearance is fast, and the high color disappears slowly;Depending on the disappearance of the golden road, you can determine the color of gold jewelry in comparative cards.
There are many ways to identify gold jewelry. The Chinese folk summarizes a set of simple methods. The formula is: seeing color, weight, listening rhyme, folding hardness, stone grinding, contrast cards, acid points, and color.The first four sentences depends on the eyes and the feeling; the latter four sentences need to be used by tools and reagents.I hope to help everyone choose the gold jewelry of the heart.
Please indicate the source in China

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