I think you can buy aloe gel from health food stores, but the queers put preservatives and stabilizers in it, not sure if you would want that in you Colloidal Silver gel.
I find you can let the aloe gel dry out, then re-hydrate with Colloidal Silver .
It just sucks in the water and silver like crazy. Aloe is really good for wounds ect.
Even better, applied topically it dries out eventually, just add Colloidal Silver and its back to a gel. The aloe literally forms a layer over the skin, which will suck in and hold the silver to the skin.