Identification of gold jewelry in many ways, a Chinese folk easy way to sum up, the formulas are: to see glory, weigh weight, listen to phonology, folding hardness, stone mill, compared to cards with acid point, given fineness. First four by eyesight, the feel; after four need the help of tools and reagents.

First, look at glory

According to the different gold luster and color can be generally distinguished gold, K gold, real gold and fake gold. Red yellow or gold to better than 95% purity; is yellow purity of 80% purity left in the glazed green yellow pox left 70% of the glaze slightly yellow gray pox about 50% purity. Therefore, formulas for the "seven green, eight yellow, 1995 red, yellow and gray vaginal discharge in half gold." If the hide for a long time for the beginning of the jewelry, there are "green copper, silver black, Jin Zaiyong far color" argument.

Second, look at the density

The density of gold is 19.32 g / cc, compared with the volume of silver, lead, tin, about twice as heavy. Available formula: a certain quality of gold jewelry (grams) of gold jewelry than on a certain volume (cubic centimeters) is the density. Obtained by measuring the density of gold jewelry, a density of 19.32 grams / cubic centimeter or so was pure gold, pure gold or more, otherwise the color is not pure gold or in gold (this method of jewelry without any destructive).

Third, the folding hardness

Gold has little ductility and hardness characteristics, can be pressed into the sheet thickness of 12.7 microns. Purity is high, carved with a pin or nail can leave marks. More than 97% purity of gold jewelry, two or three times after bending, bending at the wrinkles, also known as fish-scale pattern; 95% of the fineness of gold jewelry, bending when you feel hard, fish-scale pattern is not obvious; 90% purity of gold jewelry, bending hard when there is no fish-scale pattern; containing impurities of gold jewelry, bending down two or three times that; such as a living gold production, bend the broken, sand-like cross section significantly. This method should take into account the width of jewelry and thickness, thick, wide on some hard, thin, narrow it softer.

Fourth, listen to phonology, see the flexibility

High purity of gold jewelry by the hard-hit or to throw, to issue "despair puff, puff despair," whispered the boredom, and no phonological, no elastic, K gold with phonology, sound, elastic, stretch the greater the phonological The more pointed the more elderly, the fineness of the worse.

5, with identification of fineness touchstone

The use of gold on the card (fineness of gold have been identified) and were tested on the touchstone of jewelry in the mill road, by comparing the color to determine the fineness of gold jewelry. This method should be carried out under natural light and fluorescent light, not in direct sun light and incandescent manner.

Six points with acid

Grind the touchstone were identified on the jewelry and the Golden Road on the cards, with a glass rod in the Golden Road nitrate test point, because gold is chemically stable elements do not react with the acid, so the color change. Either gold or pure gold, gold road then disappear or to change. Variation is the "three fast, three slow", that the disappearance of low fineness fast, slow disappearance of the high fineness; mixed gold disappear fast, clear gold disappear slowly; large mixed gold disappear quickly, minimum miscible gold disappear slowly. Golden Road, disappeared depending on the situation, compared to the fineness of gold jewelry brand can be determined.

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