Abstract
I. The fact, that the blue violet colour of the microcosimic salt bead of cobalt is changed into blue by addition of Na 2CO 3 K 2CO 3, K 2CO 3 NA 2HPO 4 or NA 3PO 4is explained by the formation of pyrophosphate in the melt. II. K 2Na 2P 2O 7 if melted together with CoCl 2 forms blue porcelaneous masses, completely soluble in water.
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