If you make money, you always have to buy some gold jewelry, but many people don't know how to identify the authenticity and the purity of gold. I'm going to teach you a few moves today.
Tips for distinguishing the authenticity of gold jewelry:
1. Look at the color
According to the different luster and color of gold, we can roughly distinguish pure gold, K gold, true gold and false gold. The old jargon handed down from pawnshops is "seven green, eight yellow, nine five red, yellow and white with gray to half gold" to describe the purity of gold. If the color is green and white, the purity is not high, and if the color is red and yellow, the purity is high.
2. Look at the mark
According to the regulations, all domestic gold ornaments should be marked with a mark, indicating that the purity is above 99.6% if it is marked with 24K, and above 75% if it is marked with 18K.
3. Look at the hardness
Gold of high quality can be marked with pins or nails. More than 97% of the gold jewelry with good quality will have wrinkles at the bend after two or three times, which is also called fish scale pattern; about 95% of the gold jewelry with good color will feel hard when bending, and the fish scale pattern is not obvious; about 90% of the gold jewelry with good quality is hard when bending without scale pattern; the gold jewelry with more impurities will be broken after bending for two or three times; if it is made of raw gold, it will be broken after bending, and the section will be obvious Sand grains.
4. Listen to the sound
If more than 99% of the real gold is thrown on the hard ground, there will be a sound, no rhyme and no elasticity. Fake or low quality gold sound crisp and no dull feeling, generally issued "Dangdang" sound, and the sound has residual sound, after landing, it jumps violently.
5. Weigh the weight
When the specific gravity of gold is 19.3g/cm3, the relationship between fineness and specific gravity is large. When the specific gravity is close to 19.3, the higher the pure gold content is. Hand weigh its weight to see whether it is commensurate with the size of the volume, large and light shape may be adulterated. But generally in the hands, if slightly heavy feeling can be perceived as genuine gold jewelry, visible gold body small weight. We should be alert to big and light ornaments, and carefully distinguish whether they are fake or semi fake.
6. Try hard and soft
The higher the fineness of gold jewelry is, the softer it is and the less elastic it is. There will be light marks when the real gold is bitten or scratched with a needle, and there will be no broken lines when folded by hand. The steel with low color is hard; the one with heavy mixing is elastic, brittle and easy to break. Pure gold is relatively soft, generally do not need to do inlaid jewelry, so, where inlaid gold jewelry claims to be 24K, there must be fraud.
7. Scraping porcelain plate method
Find an unglazed porcelain plate. If you don't have one, you can buy one at home decoration shop. If there are black scratches on the porcelain plate, your gold ware is not real gold. If the scratch is gold, it is real gold.
In this way, the fake gold can be revealed, but your gold may be scratched.
8. Nitric acid test
Put the gold into a small stainless steel container, drop a drop of nitric acid on the gold, and observe the reaction. If the acid drop is green, the gold is either made of ordinary metal or plated with gold. If it is golden, it is gold-plated copper. If it is milky, it is plated with gold and silver. If there is no reaction, then the gold is real.
Nitric acid test is a good way to identify the authenticity of gold, but because nitric acid is not easy to obtain, and it is dangerous to operate at home, it is suggested that everyone should give it to the jeweler.
Maintenance methods of gold jewelry
1. The chemicals in detergent can change the color of gold, so you should take off the gold ornaments before cleaning.
2, avoid direct contact with perfume, hair gel and other high volatile substances, otherwise it will easily lead to fading of gold ornaments.
3. When swimming, gold ornaments should be removed to avoid chemical changes on the surface of the water or pool water.
4. When keeping it, wrap it with flannel and put it into the jewelry box to avoid mutual friction and damage.
5. Gold is soft and easy to deform, so don't pull necklace and other accessories to avoid deformation.
6. Pure gold jewelry in the presence of Mercury will produce chemical reactions, white spots, cleaning as long as the alcohol lamp barbecue for a while, you can restore the original color.
7. Gold ornaments often lose luster due to stains and dust. At this time, it is only necessary to put the gold ornaments in neutral detergent, soak them in warm water, and then take them out and wipe them dry.
