"Father's Day" is close at hand, and I have missed so many Father's Days. This time I will boldly show my daddy!
"Love is a word, I only say it once." When Zhang Xinzhe sang this song, he probably did not expect that he would portray the Chinese's implicit and restrained expression so accurately. Although today's young people are more open to emotional expression, when faced with their closest family members, the majority of netizens have said that they still can't take the hurdle of "love you in your heart."
I love you, but I am embarrassed to say... then use gold to express our love for my father!
Because of its scarcity, speciality and preciousness, gold has been regarded as the head of hardware since ancient times and has the title of “king of metalâ€. The amount of gold resources identified in the world is only 89,000 tons.
Tanabata is near, and the price of gold has risen. I believe many people have already sharpened their knives and prepared to shoot. But how much do you know about gold? How do you tell the truth?
Are gold and K gold all gold? How is gold classified?
Because of the softness of pure gold, people will add a small amount of silver, copper, zinc and other metals to the gold to increase the strength and toughness of gold, so gold is classified according to purity. However, in recent years, with the improvement of gold processing technology and the application of new technology, some pure gold jewelry has also achieved higher hardness. According to the relevant national standard, the gold content is not less than 990 ‰, that is, it is expressed in full gold, and the gold content is not less than 999 ‰, which is expressed in thousands of gold. The unit for determining the gold content in the goldsmith is called "Golden Position", the English is "Karat", and the English prefix can also be referred to as "K". Common 18K and 10K gold products have a purity of 750‰, 417‰, and generally 24K is 99.99% pure gold.
Is there any easy way to identify the authenticity of gold?
There is a simple mouth: 掂 weight, look at the color, audition rhyme, soft and hard, with acid. Specifically summarized as the following 6 points:
1. When the hand is bent, it is soft and easy to bend. It is easy to pull with a hand, and it will be traced when it is scratched with a hard object.
2. Throw a "beep" on the floor, the fake sound is sharp, and it jumps higher than the real gold.
3. Really dark yellow, excessive red is pseudo-gold, light color is silver, aluminum and other mixed gold
4. The same volume, really heavier, fake lighter
5. Really encounters an emergency fire without discoloration, fake does not fire, turns black and purple, not bright
6. After burning red, it will be quenched into water and the color will remain unchanged.
How to maintain gold jewelry?
1. Chemicals such as detergents will change the color of gold and remove gold jewelry before cleaning.
2, avoid direct contact with high volatile substances such as perfume, hair gel, otherwise it will easily lead to fading of gold ornaments.
3, remove the gold ornaments when swimming, so as not to touch the sea water or pool water, the surface layer produces chemical changes.
4. When storing, wrap it in a velvet cloth and put it in the jewelry box to avoid mutual friction and damage.
5, gold is relatively soft, easy to deform, so do not do the pulling action, so as not to deform.
6, pure gold jewelry in the case of mercury will produce a chemical reaction, white spots appear, as long as you wash under the alcohol lamp for a while to restore the original color.
7. After wearing, the gold ornaments often lose their luster due to the stains and dust. At this time, just put the gold ornaments in a neutral detergent and soak them in warm water, then remove them and wipe them dry.
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