Rapid bleaching method for pearl and bleaching solution

Abstract

The invention discloses a pearl bleaching processing method, which comprises the following steps: perforating the pearl, immersing by a mixing solution of dilute sodium hydroxide and a surfactant and then washing, washing by clear water and drying, placing the pearl in a pretreatment fluid for immersing for 10 hours, taking the pearl out and washing by clear water, forming a smooth dark brown compact layer on pearl surface; placing the pearl in a bleaching solution A, irradiating for 30 minutes under ultraviolet light, changing the liquid, repeatedly bleaching for 2 hours, taking the pearl out and washing, placing in a bleaching solution B, irradiating for 30 minutes under ultraviolet light, changing the liquid, repeatedly bleaching for 4 hours. The pearl is processed by the pearl bleaching technology, through multitime reality application, the bleachability of light pearl can reach as high as 98%, and the bleachability of dark pearl can reach more than 90%.

Description

technical field [0001] The invention relates to a pearl bleaching process and a bleaching solution corresponding to the corresponding process. The invention belongs to the technical field of bleaching pearls by chemical and physical technology. Background technique [0002] Pearl is the secretion of mantle cells of some shellfish in the double class of molluscs. It is a specific crystal structure formed by the alternating arrangement of thousands of layers of inorganic calcium carbonate crystal layers and thin layers of biomacromolecule keratin. Artificial cultured freshwater pearls are mostly round, oblate, oval and shaped. The colors are miscellaneous white series, red series, yellow series, black series and so on. Raw beads collected from farms need to undergo a series of processing procedures such as sorting, punching, bleaching, brightening, and stringing to become decorative ornaments with aesthetic value. Among them, bleaching is the most critical process in pearl ...

AI Technical Summary

Problems solved by technology

[0003] The existing bleaching process mainly includes dissolution decolorization, chemical decolorization, etc., but because of the unique physical and chemical properties and crystal structure of pearls, greater density and hardness, specific optical The surface, as well as the water environment and culture cycle of artificially cultured pearls in my country are different, which leads to large differences in the numerical range of the above characteristics. Disadvantages such as the bleaching process is laborious and costly