1. Composition: Seawater pearls contain an organic substance called "nacre", which will absorb light energy and convert it into fluorescent energy under ultraviolet irradiation, making pearls emit yellow-green light.
2. Identification means: ultraviolet lamp irradiation is one of the important means to identify the authenticity of pearls. Real seawater pearls will show unique yellow-green fluorescence under ultraviolet irradiation, but artificial or treated pearls often do not have this reaction, which is helpful for consumers and appraisers to distinguish between true and false.
3. Fluorescence beauty: Yellow-green fluorescence is a natural aesthetic expression of seawater pearls, and it is also one of the reasons why they are loved. Under proper lighting conditions, this pearl will give off charming light and increase its ornamental value as jewelry. At the same time, because the fluorescence degree and color of each pearl may be different, each seawater pearl has its own uniqueness.
Knowledge about ultraviolet rays
1, definition and characteristics: ultraviolet light is a part of the electromagnetic spectrum, which lies between visible light and x-rays. Its wavelength range is between 10 nm and 400 nm. Ultraviolet light has short wavelength, high energy and strong chemical activity, which can excite electrons in molecules and cause chemical reactions.
2. Natural and artificial sources: part of ultraviolet rays come from sunlight, and only a small part can reach the earth's surface after being filtered by the earth's atmosphere. This part of ultraviolet light is very important to life on earth, because it can promote photosynthesis of plants. On the other hand, artificial light sources such as ultraviolet lamps can also generate ultraviolet light, which is often used in curing coatings, disinfection and sterilization.
3. Biological effects: Ultraviolet rays have some important biological effects on living things. Proper ultraviolet irradiation can help the human body to synthesize vitamin D, which is helpful for bone development and health. However, excessive ultraviolet radiation may cause skin damage and increase the risk of skin cancer. Therefore, in our daily life, we need to properly protect ourselves from ultraviolet radiation.