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Showing posts from June, 2019

CHEMICAL COMPOSITION OF GEM STONES

EARN MONEY WITH MAKING PRUSSIAN BLUE

       Prussian blue used industries :                                              pharmaceutical industries                                              dye chemical industries                                                                                                    ink industries               annually 12,000 tonnes is required only for ink industry  uses of Prussian blue: the Prussian blue is widely used in oil,water color...