Prepare baking soda, an old toothbrush, toothpaste, pour some baking soda into the bowl, squeeze some toothpaste, and put the gold ornaments that need to be cleaned in; Pour warm water, stir and dissolve, let stand for 5 minutes, and carefully brush the gold ornaments with an old toothbrush; Rinse the gold ornaments and dry the water with a paper towel. Some small cracks are not easy to clean. You can pick them with a toothpick.

Gold ornaments are black, depending on the specific parts, and it is normal if they are in the buckle. "Due to the requirements of the production process, the buckle needs to be elastic, but it can't be pure gold. According to national standards, gold with a purity of over 900 should be used. This buckle will be mixed with other metals, and it is normal to appear red and black. For "rusty" gold ingots, it is not uncommon for some gold coins and gold ingots with qualified purity to have "rust" on their surfaces. The main reason is that gold is not cleaned during production and processing. For example, dust and other substances are brought in the process of pressing gold bars. After storage for a period of time, it will oxidize under the conditions of light, air and so on, forming rust spots, which can be easily removed by professional cleaning.