>>> > Ca3(PO4)2+2H2SO4 == Ca(H2PO4)2+2CaSO4
>>> > Ca(H2PO4)2 == Ca(PO3)2+2H2O
>>> > 3Ca(PO3)2+10C == Ca3(PO4)2+4P+10CO

>>This sounds a lot like a historical recreation of the synthesis of
>>phosphorus.  Concentrated horse urine was used as the phosphate source
>>and I think, charcoal the carbon.

>*Horse* urine??!!!  Doubtless you refer to Brandt's original prep?  I
>had always assumed that he used his own.

>As a youngster (and ignorantster) I once tried making phosphorus by a
>fanciful perversion of the Brandt method: boiling pee in a coffee can.
>I would discourage anyone from repeating the experience.  It smells
>really horrid, especially after the water is gone and the residue
>begins to char.