about one half hour and the material is transformed to a powder suspension the suspension at this point is allowed to stand a few minutes until the suspended powder settles and then the clear supernatant solution is decanted off three hot deionized water washes are used by adding water stirring for about 5 to about 10 minutes settling then the clear supernatant liquid is decanted off the slurry after the third water washed is filtered and the filter cake is then oven dried at about 120 u00b0 c to a bone dry state and then sifted through a 60 mesh sieve data given in table 1 for sample number 2 and in fig1 is typical for material prepared according to this procedure fig1 is the emission spectra of the y 0 95 in sub 05 po 4 prepared by this example the material is fired for about 1 hour at 500 u00b0 up to 900 u00b0 c and then an additional 2 hours at about 900 u00b0 c before removal from furnace to cool the material is then broken up with mortar and pestle and 20 parts of na 4 p 2 o 7 sup 10h 2 o is blended in as a flux and the fluxed material is then refired at about 1100 u00b0 c for about 16 hours when given the general post fire treatment described for example 1 the above material is a crystalline powder that strongly emits blue under 80.