Identification of jewelry equipment, both consumers and the jeweler, often engaged ingem trading in the spot, therefore the master essential gemstone identification method is rapid and accurate, simple and economical.
Gold and silver identification can be divided into two parts
One, from the physical properties of differential
1, we must first look, this is one of the oldest and most direct method. Because thegold and silver according to the gold content in different will be showing a different color, and this is what we usually high fineness of gold. The folklore of a "sevengreen, eight yellow, nine purple, ten red" pithy formula. The ancients believed thatgold color should be yellow, I slightly cold red, therefore, with "gold" to represent thegold. But the absolute sense of pure gold silver, there is No. When we identify the gold and silver wares, first to see its color, if it is pure, the color should be yellow.There are some counterfeiters, doped with other metals in gold, it must affect the luster. In general, the more impurities doped, gold color is more pale. Identification ofexperienced experts to see if its composition, can roughly determine the gold content.
2, listen to is also the key link. In general, the gold is high density metal, fell on hardwooden boards, a relatively dull sound; such as copper, iron, fell to the ground will be relatively clear sound. True gold 1 metres off the ground naturally fall on the groundbounce off, no more than three, while the fake products will be more than.
3, pay attention to "pull". We all know that gold has good ductility, the purity of gold is higher, the texture is soft, therefore, gold products generally easily not easily broken,false easily broken not easily, if the bite, will leave an imprint on the side. With acommon pin, can also be easily scratched. A piece of gold artifacts in hand, if in the weak point or small offices, with your fingers gently pull, can feel the soft texture.
Two, from the chemical nature of identification
1, the fire. As the saying goes "True gold does not fear fire", the gold into the fireburning, the same color take out. According to the gold and chemical properties of stability, not easy to be oxidation properties, can burn test.
2, acid. According to the property of gold corrosion resistant, chemical test were identified by. The general test of gold by using nitric acid as reagent. First with theglass rod with small amount of nitric acid, then gently drop to wipe utensils, if keep a straight face, is gold. Fire above and method of acid drops, is the most effective method of identification of gold and silver, with a high degree of accuracy, but alsohas great destructiveness. A seemingly authentic exquisite device, who also will not risk the use of this method, therefore, focus on the identification of gold and silver orshould be placed on the physical properties of the differential. If the conditions, can also use modern high-tech means, such as X ray fluorescence analysis, chemicalqualitative analysis. Science and technology is of high accuracy, and can know the fineness of gold, silver.