With the continuous improvement of gold detection ability, the adulteration skills of gold products in the market are increasing day by day. Traditional detection methods can only be effective for some adulterated gold quality, and it is difficult to explore general detection methods such as iridium and tungsten doping in gold products. Here are four ways to test real gold: 1, "Real gold is not afraid of fire". Burn the gold bars on the fire for a while and observe their changes. Because iridium will combine with oxygen in the air to produce oxidation reaction, gold bars with insufficient purity will turn gray; And pure gold will appear bright red after being baked by fire. 2. Measure the specific gravity. First, measure the weight of a pure gold bar with a balance, then put the gold bar into a measuring cup and pour water to drown it. Then put the detected gold bars into a measuring cup and observe whether the scale of water rises or falls. As long as there is a change, it means that gold bars are not pure gold. But if it is gold jewelry, this method is not applicable, because there is air in gold jewelry. 3. Cut the gold bar with scissors and observe its cross section with a magnifying glass. If you see a white bright spot, because gold and iridium can't blend together, it means that iridium is doped in gold. Listening to the sound of throwing the ground, real gold throwing concrete will make a dull click, which is also commonly known as the dead sound. On the contrary, low-quality or fake gold ornaments have rhyme, and the sound is sharp and long, with a slight rebound.