Is Lao Fengxiang's gold ring fake?

Lao Fengxiang's gold ring is generally not fake if it is a normal channel. The methods to distinguish the true from the false are as follows:
first, look at the color
according to the different luster and color of gold, you can roughly distinguish pure gold, K gold, real gold and fake gold. That is, the best gold is red yellow, and the fineness is more than 95%; The fineness of positive yellow is about 80%; The fineness of cyan yellow is about 70%; Yellow is slightly gray, and the fineness is about 50%. Therefore, the formula is "seven green, eight yellow, nine five red, yellow and white with gray and half gold". For jewelry that has been stored for a long time, there is a saying that "copper turns green, silver turns black, and gold never changes color"
2. Folding hardness
gold has the characteristics of ductility and low hardness, and can be pressed into thin slices with a thickness of 12.7 microns. When the quality is high, marks can be left with pins or fingernails. More than 97% of the gold jewelry with good quality will appear wrinkles at the bend after being bent two or three times, also known as fish scale lines; About 95% of the gold jewelry with good quality feels hard when it is bent, and the fish scale pattern is not obvious; Gold jewelry of about 90% quality is very hard when folded, without fish scale lines; Gold jewelry with more impurities will break after bending for two or three times; If it is made of raw gold, it will break when it is bent, and the section will have obvious sand grains. When using this method, we should consider the width and thickness of jewelry. The thick and wide ones are harder, and the thin and narrow ones are softer
Third, listen to the rhyme and see the elasticity
when gold jewelry with high fineness is knocked or thrown on the hard ground, it will make a dull low sound of "puta, puta" without rhyme and elasticity. K gold has rhyme, sound and elasticity. The greater the elasticity, the sharper the rhyme, the longer the fineness
IV. density
the density of gold is 19.32g/cm3, which is about twice as heavy as silver, lead and tin in the same volume. Available formula: the mass (gram) of a certain gold jewelry is equal to the volume (cubic centimeter) of a certain gold jewelry. Find out the density of the measured gold jewelry. If the density is about 19.32g/cm3, it is pure gold or relatively pure gold. Otherwise, it is non pure gold or gold with color difference (this method has no damage to jewelry)
v. use the touchstone to identify the fineness
use the gold pair (gold medal with determined fineness) and the tested jewelry to grind on the touchstone, and determine the fineness of gold jewelry by comparing the colors. This method should be carried out under natural light and fluorescent lamp, not under direct sunlight and incandescent lamp
VI. grind the gold path of the identified jewelry and the matching brand on the touchstone with acid point
and test nitric acid on the gold path with glass rod. Since the chemical property of gold is stable and does not react with acid, the color remains unchanged. If it is not gold or pure gold, the golden path will disappear or change. The change law is "three fast, three slow", that is, the disappearance of low quality is fast, and the disappearance of high quality is slow; Mixed gold disappears quickly, while clear gold disappears slowly; Large mixed gold disappears quickly, while small mixed gold disappears slowly. Depending on the disappearance of the golden path, the fineness of gold jewelry can be determined by comparing the cards.

Free viewing of paid content for a limited time