Bleach, Golden Dye and Identification of Pearls

In the tradition of pearl bleaching process , based on the bleaching agent were added to a new bleaching process test: in the bleaching process by adding an appropriate amount of sodium pyrophosphate , increasing freshwater cultured pearls bleached whiteness ; adding an appropriate amount of magnesium sulfate, hydrogen peroxide to improve efficiency. Through trial and bleaching process improvements to achieve the desired results. The use of Reactive Yellow M-3RE, Sunset Yellow 85 and Reactive Dyes K-4G right golden pearls staining test , the test cycle through several tests and follow-up tests to improve the dyeing process , better contrast dye staining results , namely dye reactive Dyes K-4G can be a very good combination with pearls dyed to achieve better results. Using laser Raman spectroscopy , UV -Vis-NIR spectrophotometer and fluorescence spectroscopy natural golden pearls, the market is very vivid golden yellow staining of the test to get pearls and golden pearls dyed do the test sample analysis , the sample in the instrument test medium has its own characteristics , their difference is mainly due to the external organic dye .