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The reasons of ZnWO4 and NaGd(WO4)2 laser crystals coloration were studied by measurement of impurity compositions of the grown crystals and of the initial chemicals, as well as by optical absorption and photoluminescence spectroscopy. The coloration of ZnWO4 crystals appears due to the usage of Pt/Rh crucibles, while the reason of greenish coloration of NaGd(WO4)2 crystals is accidental chromium impurity.