Influence of Dyeing on Structure and Luster of Seawater Cultured Pearls
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摘要: 为了研究染色对海水珍珠结构和表面光泽的影响以及染料的主要渗透途径与结合部位, 通过对比染色实验、扫描电子显微镜和宝石显微镜, 对染色前、后的海水珍珠样品表面和内部特征进行了观察与分析, 采用显微分光光度-偏光显微镜测量染色前、后海水珍珠样品的表面反射率变化以及运用红外光谱测定染色前、后海水珍珠样品的成分。结果表明, 在染色过程中, 染料是通过海水珍珠珠孔处珠核和珍珠层间的有机质空隙以及漂白造成海水珍珠表面有机质疏松结构而渗透到珍珠的内部, 主要与海水珍珠内的有机成分作用而使其着色。染色后海水珍珠样品的砖墙型层状结构未改变; 染料对海水珍珠表面的有机质疏松结构具有填充作用, 增强了其表面的镜面效应, 使光泽度增强。Abstract: To study the influence of dyeing on the structure and luster of seawater cultured pearls and to explore the penetration ways of dye liquor in the dyeing process of seawater cultured pearls, the present paper observes and analyzes the surface structure and internal characteristics of the seawater cultured samples before and after dyeing by using the dyeing experiment, scanning electron microscopy and gemmological microscope, measures the changes in surface reflectivity of the samples before and after dyeing by microscopic spectrophotometer-polarizing microscope, and identifies the components of the samples before and after dyeing by infrared spectroscopy.The results show that the dyes penetrate into the interior of pearls during the dyeing process mainly through the gap between the bead nucleus and the nacreous layers and the loose organic parts of the pearl surface, and then the dyes interact with the organic matter of the pearls.The brick-and-mortar structure of the pearl samples after dyeing remains unchanged.The dye particles combined with the organic matter between the crystal layers of pearl surface could fill in the gap caused by bleaching, thus the mirror effectiveness of pearl surface could be enhanced, and pearl surface luster could be improved after dyeing.
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Keywords:
- seawater cultured pearl /
- dyeing /
- pearl structure /
- pearl luster
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