Pearl color fading processing method

Abstract

The invention provides a pearl discoloration treatment method, comprising the following steps: performing steam bath on pearls using the mixture agent of organic solvent and water; soaking the pearls in absolute ethyl alcohol; treating the soaked pearls using hot air and finally bleaching the pearls. The discoloration treatment method uses the combination method of hot steam and hot air and the pearl color is mostly discolored after the two discoloration treatment methods with little damage on the pearl. The contrast analysis measurement shows that: the treated pearls have obviously increasedwhiteness, glitter and brightness compared with the pearls which are not treated and the treated pearls have increased whiteness, excellent brilliance, small pearls damage, compared with the pearls which are treated using the traditional technique; the pearl discoloration treatment method has largely reduced discoloration time compared with the traditional technique.

Description

(1) Technical field [0001] The invention relates to a pearl fading treatment method. (2) Background technology [0002] Pearl is an organic gemstone, which is composed of more than 92% calcium carbonate, about 4-6% shell keratin and a small amount of water, amino acids, trace elements and pigments. It is formed in the body of shellfish under accidental or artificial conditions, that is, when the external irritating small impurities enter the body and contact the mantle, the mantle is stimulated to secrete a kind of nacre, and these tiny A growth formed by wrapping layers of impurities. The formation of pearls will have different colors due to the influence of water quality, nutrition, trace elements and other factors. The color of pearls is generally composed of two parts: natural color and secondary color: the body color is also called body color or background color, which depends on the content of the pearl itself. Various pigments and color-causing elements, the most co...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional method of optimizing the fading of pearls usually adopts (high temperature water boiling at about 90°C for 4 to 10 days) + (organic solvents such as acetone and toluene at 40 to 60°C for 2 to 4 days) + (alcohol oxygen bleaching at about 40°C for 6 days) ~10 days), the fading treatment time is generally 12 days to 24 days, after a long time treatment by the above process, the keratin in the inner shell of the pearl is partially hydrolyzed, dissolved and oxidized, and the bonding between the calcium carbonate crystal and the nacre is weakened. The texture of pearls is greatly damaged. The white pearls prepared by this kind of fading process are prone to the problem of pearl luster and powdery surface during the long-term natural oxidation and light process, and the production cost increases due to the long processing cycle. , sometimes unable to meet customer order needs in the short term. At the same time, my country's current pearl fading technology is still at a relatively backward level compared with foreign countries, and is in a disadvantageous position when participating in domestic and foreign market competition. Therefore, it is imminent to improve the pearl fading technology level.