Thousands of pearls have gradually expanded their influence in the market in recent years, and as a result, many counterfeit products have also been produced. How to distinguish the true and false pearl necklace? Xiaobian is your trick.
Appearance observation The cultured pearl wrap layer is thin and transparent, and has a waxy luster on the surface. Thoroughly wash the hollow hole of the pearl, then illuminate it with strong light, and carefully observe the hole with a magnifying glass. For the cultured beads, there is a clear dividing line between the huge core and the outer layer. The boundary line often has a black footprint, so it is easier to see. For natural beads, the very fine growth line will always be evenly centered, with a yellow or brown color near the center.
For a string of pearls, untie the hooks, straighten the necklace, and slowly rotate the beads under intense light. For cultured beads, when you turn to the right angle, you will inevitably see the flash of the cue ball core reflection, generally flashing twice in 360 degrees, which is roughly evidence of the identification of the cultured pearl. The pearl can also be pointed at the glare, and its translucent interior is observed. For the cultured beads, parallel lines of the inner layer of the core sphere may be seen, and the thin layers are cross-cutted in a row. Sometimes the boundary between the skin and the endothelium can be seen. If it is a natural bead, it can be seen that the edge of the transmitted glare pearl gradually weakens toward the center. In order to make the observation effect good, prepare an opaque plate, dig a small hole with a diameter of about 1mm, first block it with the baffle, and let only the small strong beam emitted from the small hole hit the pearl. The observation is most clear.
Pearls of normal color do not need to change color, but if you see rare gray black and black pearls, you should be vigilant. Because it may be stained. The dyeing method known at present is that the pearl is soaked in a silver nitrate solution, taken out and placed in strong sunlight to become black. The difference is that the natural black pearl is not pure black, but a dark blue black with a rainbow flash or a black with a bronze hue. Counterfeit products are artificially made fake pearls (also known as imitation beads). There are generally three methods of manufacturing:
The wax-filled glass imitation beads are filled with paraffin wax in a hollow round milky glass sphere. The density of the imitation beads is small, generally 1.5g/mm3 can be distinguished by hand. It is useful to detect the inside of the ball with a soft needle, the outer needle is not moving, and the surface is smooth. The solid glass imitation beads are made by soaking the milky white solid glass ball in the "bead semen". Observed at the borehole with a 15x magnifying glass, only a thin layer of “real pearl semen†was found. It was peeled off with a needle and there was no fine scaly powder.
The plastic coated imitation beads are plated with a thin layer of “bead semen†on the milky white plastic. The magnifying glass is used to observe the surface of the coating with a uniform distribution of pimples, which is not as smooth as natural pearls or cultured pearls. Use a needle to pick up, peel off the pieces, no fine powder.
The mother-of-pearl imitation pearl is made of a layer of pearl on a thick shell, and the density is not much different from that of a real pearl. The best way to identify it is to place it in front of a strong light source. It is often seen in transmitted light with a distinct parallel strip, which is a trace of pearl powder layering.
Woolen Herringbonr Design Fabric
Woolen Herringbonr Design Fabric,Black And White Fabric,Woolen And Poly Fabric,Custom Woolen Herringbone Fabric
SHAOXING GONGXIANG FASHIONABLE DRESS CO.,LTD. , https://www.gxboucle.com