漂白充填染色处理紫色翡翠的鉴定特征

Identification Characteristic of Purple Jadeite Treated with Bleaching,Filling and Dyeing

为探究漂白充填染色处理紫色翡翠的鉴定特征,采用宝石显微镜、折射仪、紫外-可见近红外光谱仪、能量色散X射线荧光光谱仪、钻石紫外荧光仪、傅里叶变换红外光谱仪和拉曼光谱仪等测试仪器对天然及处理紫色翡翠样品进行检测与分析。结果表明,漂白充填染色处理的紫色翡翠内部结构被破坏,红外光谱仪和拉曼光谱仪检测可见环氧树脂特征峰,拉曼光谱可见疑似染料的强峰1596 cm^(-1),发光图像可见环氧树脂与有机染剂所形成聚合物的特征蓝紫色荧光,紫外-可见光谱具有200~350 nm的吸收宽带、409 nm吸收峰、569 nm附近的宽吸收带。紫色抛光粉残留致色的翡翠内部结构未破坏,仅表面残留紫色粉末颗粒致色,发光图像可见紫色粉末导致的粉紫色荧光,紫外-可见光谱可见强的以558 nm为中心的吸收带和弱的以611 nm为中心的吸收带,与天然紫色翡翠有所区别。

To explore the identification characteristics of purple jadeite that is treated with bleaching,filling and dyeing,the gem microscope,refractometer,UV-Vis-NIR spectropho-tometer,XRF spectrometer,DiamondView^(TM),FTIR and Raman spectrometer were used.The results showed that the internal structure of the purple jadeite samples treated with bleaching,filling and dyeing was destroyed,and epoxy resin was detected by infrared spectrometer and Raman spectrometer.Strong Raman peak at 1596 cm^(-1) could be the characteristic peak of dyes.Luminescent images showed the characteristic blue-violet fluorescence of the polymers formed by epoxy resin and organic dyes.The UV-Vis spectra of the purple jadeite samples treated with bleaching,filling and dyeing showed the absorption band of 200-350 nm,the absorption peak at 409 nm and the absorption band near 569 nm.The internal structure of the jadeite stained by the purple polishing powder was not damaged,and the purple colour only stained on the surface since the powder particles only remained on the surface.The luminescent images showed pinkish purple fluorescence,which was caused by the purple polishing powder.The strong central absorption band at 558 nm and the weak central absorption band at 611 nm can be seen in the UV-Vis spectra,which are different from the natural purple jadeite.