There are three reasons why gold fades: 1. The color of gold is not enough, and it is easy to react with external substances and fade; 2, gold-plated, gold-plated fake gold will fade when worn for a long time; 3. Gold will be contaminated with human grease and sweat for a long time due to corrosion, which will lead to the fading of gold amalgam. The fading of gold may be the reason for the lack of color. Strictly speaking, it is not real gold. If the fineness of gold is not high, it is easily influenced by the outside world, and it will react chemically with some substances, leading to fading. The fading of gold may be the reason for gilding. Now many gold products are imitations. The surface is plated with gold, which is difficult to distinguish between true and false, but this kind of gold will fade when worn for a long time.