In this era, students have very little physiological knowledge, and classmates are also ashamed to talk about sensitive topics of sex, Meng Yufei has more experience than the same generation, and when she used to participate in work, she would often make some innocious jokes with colleagues, and there were a lot of colored topics, and it was not a big deal to say such things, but a girl said this to a boy, it seemed to be ...... What I just said is still quite embarrassing......

"That...... Anyway, the benefits of crystals are many, and the meaning of different crystals is also different, you see, there are impurities in this crystal bracelet you gave me that can be seen by the naked eye, see? This impurity, like clouds and cotton wool, is it natural to distinguish crystal? A very simple way to tell with the naked eye. Meng Yufei, who reacted quickly, had a slightly hot face, took off the bracelet, put it in front of Ouyang Yufan, and diverted the embarrassing topic without a trace.

Ouyang Yufan originally listened to Meng Yufei explain the meaning of different crystals with relish, but when he heard Meng Yufei talk about the effect of tea ink crystal on men, he was also a little embarrassed, and saw Meng Yufei change the topic, Ouyang Yufan answered smartly: "See, just now you said that it is A-grade, and there are B-grade and C-grade natural crystals?" ”

"Of course! Natural crystals also have AA grades! Following Ouyang Yuyufan's question, Meng Yufei popularized the level of crystal to Ouyang Yufan again.

If the grade of natural crystal is not observed with the help of a magnifying glass, the results of observation with the naked eye have several levels when it is approved: AA grade--- crystal is transparent inside and outside without flaws, and there are no visible man-made defects in appearance; Grade A1 --- with very minor blemishes, or fine natural inclusions, or clouds or cotton wool that do not exceed 3 mm; Grade A --- have minor blemishes, with clouds or cotton wool that are easily visible to the naked eye; Grade AB --- has large cloud inclusions, Xiaoice cracks, and small scratches on the surface; Grade B--- more than half of the entire crystal is cloudy and inclusional, large ice cracks, and small cracks on the outside; Class C --- the lowest level, the whole is cloud-like, the ice crack marks are obvious, and there are obvious cracks on the outside, as if it will break at any time.

Artificial crystals generally use K to distinguish grades, K1~K9, the larger the value, the higher the purity. The price varies greatly from grade to grade, and the higher the grade, the higher the price. Artificial crystal is made of raw quartz sand after a series of processes, and then manufactured by fine cutting technology and flawless polishing skills, artificial crystal is pure and transparent, making up for the lack of natural crystal. Artificial crystals also add metallic elements, such as lead, which can enhance the refraction of light and show the nobility of crystal. Due to the complicated process and superb craftsmanship of artificial crystal, some prices are even more expensive than natural crystal.

"Natural crystal is a true yin thing, and there is one of the biggest characteristics, that is, the coolness of the crystal, but I have just worn it on my hand for a while, and I can't detect it when I get close to the body temperature, and if I wear it for a while in summer, I will feel cool and very comfortable." Meng Yufei touched the crystal in her hand and said to Ouyang Yufan another way to distinguish natural crystals.

In a few years, after the development of the Internet, there is a lot of knowledge about crystal identification on the Internet, and some people say that natural crystals have always been cold, and imitation crystals do not have the coolness of natural crystals. This statement is also true, but the crystal is a bit too one-sided with such a identification method. In winter, whether it is natural crystal or imitation crystal, it is cool to the touch. Therefore, some friends who are new to natural crystals think that this is the most useful and practical way to identify natural crystals, in fact, real natural crystals cannot always maintain a constant temperature like a refrigerator, but will change with the environment and body temperature. And in the hot summer, it can even heat up, and the smaller the size, the faster the heat transfer.

"Hehe, if the natural crystal can really be as someone said, has a very cool effect, then in the summer, every family can buy a larger crystal ornament can be used as an air conditioner, and then buy a crystal bed when sleeping, and save electricity, economy, and environmental protection, you can directly eliminate the air conditioner!" Meng Yufei remembered a passage she saw on the Internet a few years later, and said it to Ouyang Yufan.

"I didn't expect there to be so many things about crystals, you are so powerful, how did you know so much?" Ouyang Yufan asked Meng Yufei with some surprise, he originally knew a little about crystals, at least he knew the composition of crystals, when he went to buy crystal bracelets, he also knew the different effects of different crystals from the cards given by the clerk, but after listening to Meng Yufei say this tonight, he found that this tablemate had a particularly thorough understanding of crystals, and I really don't know how this tablemate knew so much about crystals.

"It's very simple, I've read a book that describes crystals in detail, and all this knowledge is from the book." Meng Yufei understated this problem.

"Oh! The cake seller, miserable, miserable, the bedroom door is going to be locked, go, go! Meng Yufei raised her eyes and looked at her watch, there were 10 minutes before 22 o'clock, she didn't expect to chat with Ouyang Yufan for nearly an hour, and the lights out whistle was about to blow, so she couldn't help but be anxious, and urged Ouyang Yufan while standing up.

Ouyang Yufan stood up and asked suspiciously, "Selling cakes?" Do you want to eat? ”

Meng Yufei, who was in a hurry, was happy when she heard Ouyang Yufan's words, and laughed out loud: "Ouyang, you are really funny, the one who sells cakes is the meaning of Mygod in English, you won't say that you don't know, right?" ”

"Is that so?" Ouyang Yufan scratched his head, still a little puzzled, could it be that he drank wine tonight and his brain was a little short-circuited? But I don't think I've ever heard of that before.

"Of course it is! The homonym of Chinese! Translated as selling cakes, hehe, I forgot who I heard before, let's go, let's go, it's troublesome if you don't get locked out soon! Meng Yufei forgot again, this kind of popular word is not popular in the school now, just find a reason to prevaricate in the past, urging Ouyang Yufan to go quickly, the female dormitory has two management sisters, and when she meets the one who is easier to talk on duty, she can open the door when she goes back late, if she meets the eldest sister who is not good at talking, she will be trained for nagging, Meng Yufei doesn't want to find trouble.

"Ouyang, you're behind, I'll go ahead first, good night!" When the bedroom was in sight from afar, Meng Yufei glanced at Ouyang Yufan, who was walking behind him unhurriedly, said good night to him, and ran first. She is also taking precautions, so as not to be seen by her classmates and guess, after all, when two people come back together at night, it is not good to be seen.

"Hmm!" Ouyang Yufan agreed, and just wanted to say good night again, seeing that Meng Yufei had already run away, Ouyang Yufan could only say in his heart to Meng Yufei's back: "Good night!" Also, thank you tonight! ”

PS: There are really a lot of benefits of crystals, Sanxiao wishes everyone good luck with crystals and a healthy family!

And oh,Three smiles have a cover recommendation for the first time.,All of you who read the update of the book friends vote for a recommendation to support the next three smiles.,There's too much difference between clicking and recommending.,Thank you~~~.