Experts suggest several ways to identify counterfeit gold. One method is to examine the color—higher purity gold tends to have a richer, darker hue. Another is to check the weight; genuine gold feels heavy in your hand, while fake pieces often feel lighter. You can also listen to the sound when dropping the jewelry on a hard surface. Real gold above 99% purity makes a soft "squeak" sound, whereas fake gold may produce a sharp or metallic "dangdang" noise with lingering echoes.
Additionally, checking the hallmark is crucial. Legitimate gold jewelry usually bears clear markings like "24K" for pure gold or "18K" for 18-karat gold. Some brands may use terms like "foot red" or "foot gold," which are standard indicators of quality. However, keep in mind that these methods might not be enough against high-level frauds.
For more accurate results, it's recommended to consult a professional testing agency. Advanced tools like precious metal detectors can detect impurities such as antimony or tungsten, which are sometimes used in fake gold. If you're really concerned about authenticity, destructive testing is another option. This involves removing a small amount of material from the gold and analyzing it using a high-resolution plasma mass spectrometer. While this method provides highly accurate results, it’s costly and not suitable for everyday use.
Ultimately, if you're unsure about the quality of your gold, it's always better to seek expert help. Gold is a valuable investment, and ensuring its authenticity is essential to avoid being deceived by low-quality or counterfeit products.
We are White Through-hole LED manufacturer from China.
5 years warranty
Those White Through-hole LED was born for excellent lighting effects.
Need some really bright LEDs? Contact us now!
White Through-hole LED. It is the light produced by the blue color chip which is transformed by the special LED fluorescent powder. It does not have a fixed wavelength range and value, which meas White LED need the coordinate value of X, Y and color temperature to represent it. The difference of White SMD LED and the white Through-hole LED is the diversification of the angle, diffusivity and spotlight. In 18 years, we supply the white Through-hole LED with high efficiency, high luminance, low light attenuation has been recognized by our customers.
1, Color is wide enough to suit every one's needs and taste: White Through-hole LED typical color temperature is 2000K warm Yellow LED, 2700K warm white LED, 3000K warm white LED, 4000K white LED, 5000K white LED, 6000K white LED, 7000K cold White LED, the maximum color temperature can reach above 50000K color temperature. White Through-hole LED has been widely in the indoor lighting and outdoor lighting because of good heat dissipation, low light failure, high brightness.
2, High color purity: We can supply White Through-hole LED with high index white LED (Ra> 80), common index white LED (Ra less than 80) and super high index white LED (Ra> 90) LED. Common index white LED used in conventional lighting or electronic components. high index white LED used in lighting or fill light products. Remarkable LED lamp beads made of the product's realism will be greatly enhanced. The light produced by the High rendering index LED will make the things more vivid. We can also customize low SDCM (Color Tolerance Adjustment ) products to meet the high requirements of the customer.
3, Colorful epoxy: Water clear, white diffused, pale white diffused.
4, Variety of angle available: 5 degree through-hole LED, 20 degree through-hole LED, 30 degree through-hole LED, 40 degree through-hole LED, 45 degree through-hole LED, 60 degree through-hole LED, 90 degree through-hole LED, 120 degree through-hole LED, 140 degree through-hole LED ect.
5, Variety of shape/size available: We supply the white SMD LED, such as: Round through-hole LED, Straw hat through-hole LED, flat top through-hole, Ellipse throuh-hole LED, 3mm Through-hole LED, 5mm Through-hole LED, 8mm Through-hole LED, Rectangle Through-hole LED(2*3*4 Through-hole LED), Square Through-hole LED and so on.
6, The length of pin: LED Lamp's pin can be 17mm, 29mm, 90 degrees bent feet, braided pin and so on. Tips: taping pins can operate on a robot, greatly improving the efficiency of manual plug-ins.
We will do the High temperature resistance testing and 10 hours ageing treatment before the product out off the factory, which can ensure the stability of each product. Our LED products have 5 year warranty. Please believe that we are the best supplier for your light-emitting diode.
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Shenzhen Best LED Opto-electronic Co.,Ltd / BESTSMD CO LIMITED(HK) , https://www.bestsmd.com