Earthwriting method of identifying gold

There are many appraisal methods for gold jewelry, including color, weight, weight, listening sound, folding hardness, stone grinding, contrast cards, sour points, and fixed color.
: Look at the color, according to the different gloss and color of the gold, you can generally distinguish between pure gold, K gold, real gold, fake gold. That is, gold is better yellow (yellow -red), 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 green eight yellow, yellow nine five red, yellow leucorrhea ash pairs of gold". For long -term gold jewelry, there will be a saying that "copper turns green, silver turns black, and gold will never change color".
: Type weight, gold weighs more than double the same volume silver, lead, and tin. True gold has a feeling of falling on the hand, while copper or others only have a sense of heavyness without falling.
: Listening to the sound, when the high -quality gold jewelry is knocked out or threw it hard, it emits a dull sound of "daedy, dwelling", no sound or elasticity, K gold has a rhyme, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound, sound There are elasticity, the greater the elasticity, the more the rhyme, the more older, the worse the color. The fake or low golden sound is crispy but no dullness. Generally, the sound of "Dangdang" is emitted, and there are surplus sounds.
: Folding hardness, high -colored gold, can leave traces with large head needles or nails. More than 97%of the gold jewelry, after two or three times, wrinkles appeared at the bend, also called fish scales; about 95%of gold jewelry, it feels hard when bending, and the fish scales are not obvious; The jewelry is very hard when the bending is bent, and there is no fish scale pattern; the gold jewelry containing more impurities, the bend is twice or three times to break; 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.
Five: Use the test goldstone to identify the color, and use the determined gold and the subject's first jewelry to grind the road on the test gold stone. By comparing the color, the gold jewelry is determined. This method should be carried out under natural light and sunlight, and cannot be carried out under the direct sunlight and incandescent lamps. In the past, people used test stones to determine the general content of gold. The goldstone was a mixed black mineral such as quartz -containing quartz and menton stone. The gold was drawn on the testing stone to see the general shape of the gold. Pure gold: shiny dark yellow, thick yellow; silver -containing gold: light color transformed micro -band -inflammatory green; gold containing gold greater than 25%: earth white; copper gold: deeper color, red color tone; silver copper containing copper; Gold: yellow; gold containing zinc, same, nickel: white gold.
: Use acid points to grind the golden -identified jewelry and contrast gold on the test stone. Try the nitric acid on the golden road with a glass stick. Essence If it is not gold or non -pure gold, the Golden Road disappears or changes. The law of changes is "three fast, three slows", that is, the low -quality disappearance is fast, and the high color disappears slowly; Depending on the disappearance of its golden road, the comparison of the comparison can determine the color of gold jewelry.
Seven: Burning with fire, the jewelry is burned red (do not melt the jewelry) with fire (do not melt the jewelry). After cooling, observe the color change. Black is not pure gold. Generally, the lower the color, the stronger the color, and the darkens are all, indicating that it is a fake gold jewelry. After burning red, it is quenched into the water, and the color remains unchanged. It really does not change color when it comes to fire.

Differential gold requires some experience. The color and gloss of all kinds of gold are different. After long -term practical exploration and analysis, people have also summarized some simple basic appraisal methods.nColor and luster identification method: "Qiqing, Eight Huang, Nine with red, four or six are not gold", this formula is one of the methods of identifying golden colors. Qiqing refers to the color of 70%(70%gold) gold. Eight yellow refers to the color of 80%of the gold (including 80%of gold) gold. Nine are red, which refers to 90%, and more than 95%of gold presented in the color of dark red yellow, and 90--95%of the gold presented by gold is light red yellow. Four or six do not appear gold, which refers to gold below 60%(including 60%) of gold. The color presented is no longer the color of gold. The color of gold is completely white.nFire burning identification: As the saying goes: "Real gold is not afraid of fire." Gold does not melt or unchanged at a high temperature of thousands of degrees. Based on this, it can be burned on the fire to distinguish between true and false.nWeighing weight: Gold density is greater than common metals such as copper and silver. The gold weight of the same size is 2.2 times the weight of copper and 1.8 times the weight of the silver. Therefore, the amount can be used by hand, and then according to the size of its volume, the authenticity can be determined. Gold has a heavy feeling with his hands. This is what the "gold pending hands" referred to. On the contrary, it is fluttering.nListening to the rhyme: Throw the gold in a hard place, and the high -quality gold will make a "tap" sound. This sound is low and no rhyme. After landing, it rarely bounces. After the low -quality gold is thrown, its sound is slightly high and slightly short. After the bronze jewelry is thrown on the ground, the sound of "Dangdang" sounds, the sound is high and pointed, and the sound is long and rose. There are bouncing after throwing the ground.nFolding soft and hard: high gold folds and softness; secondary colors, increased hardness; copper strip physical folding effort, and elasticity. High -colored gold is drawn with large heads (nails, teeth bite), but not large and marks; if the brass jewelry is drawn with large head needles, the force is large and the traces are blurred. Essence