Is the Jinliufujin in Zhangjiabian, Zhongshan pure?

Common sense of gold purity identification 1, color identification method. Gold is "seven greens, eight yellows and ten reds in nine purple". It means that the blue one contains 70% gold, the yellow one contains 80% gold, the purple one contains 90% gold and the red one contains almost 100% gold. 2. Speech recognition method. Let the jewelry fall to a hard place, and the sound is dull, indicating that the color is good; The sound is crisp, indicating color difference. 3. Bending identification method. Hand-bent jewelry is soft in real gold, easy to bend but not easy to break, while fake or gold-protected jewelry is generally easy to break but not easy to bend. 4. Trace identification method. Scraping the real gold surface with a hard needle tip will have obvious marks, while the fake marks will be blurred. 5. Weight identification method. Gold has the largest specific gravity among known substances, with a specific gravity of 19: 37. Brass and copper with the same weight are much larger than gold and red gold with the same weight. Look at the color, then weigh it with your hand and you will know. 6. Fire identification method. Real gold jewelry can not change color for a long time, and fake jewelry is not fireproof. It will turn dark brown and lose its luster after burning.