Hello, Marshall, I think tetrasilver tetroxide is soluble in water. I got a one pint bottle of SilSpa, the hot tub disinfectant, and found it to be (probably) a saturated aqueous solution of Ag4o4. The label describes it as 1.0% Silver Oxide II and 99.0% other ingredients (which may be just water, but I am not sure.) The label reads further that the one pint consists of 1.33 ounce silver oxide II, equivalent to 1.16 ounce silver as elemental per gallon. The pint of Silspa has a thick sediment of grayish black Ag4o4 and a supernatant liquid that looks grayish with reflected light and amber in transmitted light. I think the supernatant liquid is an aqueous solution of Ag4o4 in equilibrium with the Ag4o4 sediment.
The label gives an FDA-type warning not to use SilSpa except for its intended purpose (i.e. as a bathing water disinfectant.) A caution: I may be totally wrong about "other ingredients" being only water. The label contains strong warnings and first aid instructions if SilSpa is misused. Does anybody know anything further about this product? Matthew
