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These are not metallic salt solutions, but a suspension of solid Cu particles. Due to the size of the articles and the processing, it has been possible to prevent coagulation of the particles, thus allowing it to be used without clogging components.
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Solid Cu particals? Those sure as heck aren't going to stay that way long. Aluminium isn't very volatile, but if you power it . . .
Think about it like this, if you expose a solid surface of metal to water or air it corrodes and the corrosion forms a barrier that keeps the rest from corroding. If you only have a single layer, then it can corrode all the way through and dissolve into ions.